HSLC 2026 â Physics (Light) : Reflection by Spherical Mirrors
A. 50 Vrery Short Questions (1 Mark Each)
- Which mirror always forms a virtual image ? āĻā§āύ āĻĻā§°ā§āĻĒāĻŖā§ āϏāĻĻāĻžāϝāĻŧ āĻāĻžā§°ā§āĻā§ā§ąā§āϞ āĻĒā§ā§°āϤāĻŋāĻŦāĻŋāĻŽā§āĻŦ āĻāĻ āύ āĻā§°ā§ ?
Ans: Convex mirror | āĻāϤā§āϤ⧰: āĻāϤā§āϤāϞ āĻĻā§°ā§āĻĒāĻŖ - What is the SI unit of focal length ? āĻĢā§āĻāĻžāϞ āĻĻā§ā§°ā§āĻā§āϝ⧰ SI āĻāĻāĻ āĻāĻŋ ?
Ans: metre (m) | āĻāϤā§āϤ⧰: āĻŽāĻŋāĻāĻžā§° (m) - What is the sign of focal length of a concave mirror ? āĻ
ā§ąāϤāϞ āĻĻā§°ā§āĻĒāĻŖā§° āĻĢā§āĻāĻžāϞ āĻĻā§ā§°ā§āĻā§āϝ⧰ āĻāĻŋāĻšā§āύ āĻāĻŋ ?
Ans: Negative | āĻāϤā§āϤ⧰: āĻāĻŖāĻžāϤā§āĻŽāĻ - Which mirror is used as a rear-view mirror ? āĻĒāĻŋāĻāĻĢāĻžāϞ āĻā§ā§ąāĻžā§° āĻĻā§°ā§āĻĒāĻŖ āĻšāĻŋāĻāĻžāĻĒā§ āĻā§āύāĻā§ āĻŦā§āĻ¯ā§ąāĻšāĻžā§° āĻā§°āĻž āĻšāϝāĻŧ ?
Ans: Convex mirror | āĻāϤā§āϤ⧰: āĻāϤā§āϤāϞ āĻĻā§°ā§āĻĒāĻŖ - What is the relation between focal length (f) and radius of curvature (R) ?
āĻĢā§āĻāĻžāϞ āĻĻā§ā§°ā§āĻā§āϝ (f) āĻā§°ā§ āĻŦāĻā§ā§°āϤāĻžā§° āĻŦā§āϝāĻžāϏāĻžā§°ā§āϧ (R) ā§° āĻŽāĻžāĻā§° āϏāĻŽā§āĻĒā§°ā§āĻ āĻāĻŋ ?
Ans: f = R/2 | āĻāϤā§āϤ⧰: f = R/2 - What is the pole of a mirror ? āĻĻā§°ā§āĻĒāĻŖā§° āĻĒ’āϞ āĻāĻŋ ?
Ans: Centre of reflecting surface | āĻāϤā§āϤ⧰: āĻĒā§ā§°āϤāĻŋāĻĢāϞāĻŋāϤ āĻĒā§āώā§āĻ ā§° āĻŽāĻžāĻāĻŦāĻŋāύā§āĻĻā§ - Which mirror converges light ? āĻā§āύ āĻĻā§°ā§āĻĒāĻŖā§ āĻĒā§āĻšā§° āĻāĻāϤā§ā§°āĻŋāϤ āĻā§°ā§ ?
Ans: Concave mirror | āĻāϤā§āϤ⧰: āĻ ā§ąāϤāϞ āĻĻā§°ā§āĻĒāĻŖ - What is the nature of image formed by a convex mirror ? āĻāϤā§āϤāϞ āĻĻā§°ā§āĻĒāĻŖā§ āĻāĻ āύ āĻā§°āĻž āĻĒā§ā§°āϤāĻŋāĻŦāĻŋāĻŽā§āĻŦā§° āϏā§āĻŦāĻāĻžā§ą āĻāĻŋ ?
Ans: Virtual, erect, diminished | āĻāϤā§āϤ⧰: āĻāĻžā§°ā§āĻā§ā§ąā§āϞ, āϏā§āĻāĻž, āϏ⧰⧠- Write the formula of magnification.
āĻŦā§āĻĻā§āϧāĻŋā§° āϏā§āϤā§ā§° āϞāĻŋāĻāĻžāĨ¤
Ans: m = –v/u | āĻāϤā§āϤ⧰: m = –v/u - What is the unit of radius of curvature ? āĻŦāĻā§ā§°āϤāĻžā§° āĻŦā§āϝāĻžāϏāĻžā§°ā§āϧ⧰ āĻāĻāĻ āĻāĻŋ ?
Ans: metre | āĻāϤā§āϤ⧰: āĻŽāĻŋāĻāĻžā§° - If image distance is positive, the image is ? āĻĒā§ā§°āϤāĻŋāĻŦāĻŋāĻŽā§āĻŦ āĻĻā§ā§°āϤā§āĻŦ āϧāύāĻžāϤā§āĻŽāĻ āĻš’āϞ⧠āĻĒā§ā§°āϤāĻŋāĻŦāĻŋāĻŽā§āĻŦāĻā§ āĻā§āύā§āĻā§ā§ąāĻž ?
Ans: Virtual | āĻāϤā§āϤ⧰: āĻāĻžā§°ā§āĻā§ā§ąā§āϞ - Object at infinity in a concave mirror forms image where ? āĻ
ā§ąāϤāϞ āĻĻā§°ā§āĻĒāĻŖāϤ āĻŦāϏā§āϤ⧠āĻ
āϏā§āĻŽāϤ āĻĨāĻžāĻāĻŋāϞ⧠āĻĒā§ā§°āϤāĻŋāĻŦāĻŋāĻŽā§āĻŦ āĻ’āϤ āĻāĻ āύ āĻšāϝāĻŧ ?
Ans: At focus | āĻāϤā§āϤ⧰: āĻĢā§āĻāĻžāĻāϤ - Which mirror has a wider field of view ? āĻā§āύ āĻĻā§°ā§āĻĒāĻŖā§° āĻĻā§āĻļā§āϝ āĻā§āώā§āϤā§ā§° āĻĄāĻžāĻā§° ?
Ans: Convex mirror | āĻāϤā§āϤ⧰: āĻāϤā§āϤāϞ āĻĻā§°ā§āĻĒāĻŖ - What is the principal axis ? āĻĒā§ā§°āϧāĻžāύ āĻ
āĻā§āώ āĻāĻŋ ?
Ans: Line through pole and centre of curvature | āĻāϤā§āϤ⧰: āĻĒ’āϞ āĻā§°ā§ āĻŦāĻā§ā§°āϤāĻžā§° āĻā§āύā§āĻĻā§ā§°ā§° āĻŽāĻžāĻā§āĻĻāĻŋ āϝā§ā§ąāĻž ā§°ā§āĻāĻž - What is the centre of curvature ? āĻŦāĻā§ā§°āϤāĻžā§° āĻā§āύā§āĻĻā§ā§° āĻāĻŋ ?
Ans: Centre of sphere of which mirror is a part | āĻāϤā§āϤ⧰: āĻĻā§°ā§āĻĒāĻŖ āĻāĻ āĻŋāϤ āĻā§āϞ⧰ āĻā§āύā§āĻĻā§ā§° - What is the sign of magnification for a real image ? āĻŦāĻžāϏā§āĻ¤ā§ą āĻĒā§ā§°āϤāĻŋāĻŦāĻŋāĻŽā§āĻŦā§° āĻŦāĻžāĻŦā§ āĻŦā§āĻĻā§āϧāĻŋā§° āĻāĻŋāĻšā§āύ āĻāĻŋ ?
Ans: Negative | āĻāϤā§āϤ⧰: āĻāĻŖāĻžāϤā§āĻŽāĻ - Which mirror is used in a solar cooker ? āϏā§ā§°ā§āϝ ā§°āύā§āϧāύāϝāύā§āϤā§ā§°āϤ āĻā§āύ āĻĻā§°ā§āĻĒāĻŖ āĻŦā§āĻ¯ā§ąāĻšāĻžā§° āĻā§°āĻž āĻšāϝāĻŧ ?
Ans: Concave mirror | āĻāϤā§āϤ⧰: āĻ ā§ąāϤāϞ āĻĻā§°ā§āĻĒāĻŖ - Object between F and P of a concave mirror forms image of what nature ? āĻ
ā§ąāϤāϞ āĻĻā§°ā§āĻĒāĻŖāϤ āĻŦāϏā§āϤ⧠F āĻā§°ā§ P ā§° āĻŽāĻžāĻāϤ āĻĨāĻžāĻāĻŋāϞ⧠āĻĒā§ā§°āϤāĻŋāĻŦāĻŋāĻŽā§āĻŦā§° āϏā§āĻŦāĻāĻžā§ą āĻāĻŋ ?
Ans: Virtual, erect, enlarged | āĻāϤā§āϤ⧰: āĻāĻžā§°ā§āĻā§ā§ąā§āϞ, āϏā§āĻāĻž, āĻĄāĻžāĻā§° - Which mirror is used by dentists ? āĻĻāύā§āϤ āĻāĻŋāĻāĻŋā§āϏāĻā§ āĻā§āύ āĻĻā§°ā§āĻĒāĻŖ āĻŦā§āĻ¯ā§ąāĻšāĻžā§° āĻā§°ā§ ?
Ans: Concave mirror | āĻāϤā§āϤ⧰: āĻ ā§ąāϤāϞ āĻĻā§°ā§āĻĒāĻŖ - Image size in a convex mirror compared to object ? āĻāϤā§āϤāϞ āĻĻā§°ā§āĻĒāĻŖāϤ āĻĒā§ā§°āϤāĻŋāĻŦāĻŋāĻŽā§āĻŦā§° āĻāĻāĻžā§° āĻŦāϏā§āϤā§ā§° āϤā§āϞāύāĻžāϤ āĻā§āύā§āĻā§ā§ąāĻž ?
Ans: Smaller | āĻāϤā§āϤ⧰: āϏ⧰⧠- What happens to image when object approaches focus of a concave mirror ? āĻ
ā§ąāϤāϞ āĻĻā§°ā§āĻĒāĻŖāϤ āĻŦāϏā§āϤ⧠āĻĢā§āĻāĻžāĻā§° āĻāĻžāώāϞ⧠āĻāĻšāĻŋāϞ⧠āĻĒā§ā§°āϤāĻŋāĻŦāĻŋāĻŽā§āĻŦā§° āĻāĻŋ āĻšāϝāĻŧ ?
Ans: Image enlarges | āĻāϤā§āϤ⧰: āĻĒā§ā§°āϤāĻŋāĻŦāĻŋāĻŽā§āĻŦ āĻĄāĻžāĻā§° āĻšāϝāĻŧ - Write the mirror formula. āĻĻā§°ā§āĻĒāĻŖā§° āϏā§āϤā§ā§° āϞāĻŋāĻāĻžāĨ¤
Ans: 1/f = 1/v + 1/u | āĻāϤā§āϤ⧰: 1/f = 1/v + 1/u - Which mirror can form a real image ? āĻā§āύ āĻĻā§°ā§āĻĒāĻŖā§ āĻŦāĻžāϏā§āĻ¤ā§ą āĻĒā§ā§°āϤāĻŋāĻŦāĻŋāĻŽā§āĻŦ āĻāĻ āύ āĻā§°āĻŋāĻŦ āĻĒāĻžā§°ā§ ?
Ans: Concave mirror | āĻāϤā§āϤ⧰: āĻ ā§ąāϤāϞ āĻĻā§°ā§āĻĒāĻŖ - What is the sign of image distance for a real image ? āĻŦāĻžāϏā§āĻ¤ā§ą āĻĒā§ā§°āϤāĻŋāĻŦāĻŋāĻŽā§āĻŦā§° āĻŦāĻžāĻŦā§ āĻĒā§ā§°āϤāĻŋāĻŦāĻŋāĻŽā§āĻŦ āĻĻā§ā§°āϤā§āĻŦā§° āĻāĻŋāĻšā§āύ āĻāĻŋ ?
Ans: Negative | āĻāϤā§āϤ⧰: āĻāĻŖāĻžāϤā§āĻŽāĻ - Define focal length. āĻĢā§āĻāĻžāϞ āĻĻā§ā§°ā§āĻā§āϝ āϏāĻāĻā§āĻāĻž āĻĻāĻŋāϝāĻŧāĻžāĨ¤
Ans: Distance between pole and focus | āĻāϤā§āϤ⧰: āĻĒ’āϞ āĻā§°ā§ āĻĢā§āĻāĻžāĻā§° āĻŽāĻžāĻā§° āĻĻā§ā§°āϤā§āĻŦ - What is the focus of a concave mirror ? āĻ
ā§ąāϤāϞ āĻĻā§°ā§āĻĒāĻŖā§° āĻĢā§āĻāĻžāĻ āĻāĻŋ ?
Ans: Point where parallel rays meet after reflection | āĻāϤā§āϤ⧰: āϏāĻŽāĻžāύā§āϤ⧰āĻžāϞ ā§°āĻļā§āĻŽāĻŋ āĻŽāĻŋāϞāĻŋāϤ āĻšā§ā§ąāĻž āĻŦāĻŋāύā§āĻĻā§ - Image formed by a convex mirror is always where ? āĻāϤā§āϤāϞ āĻĻā§°ā§āĻĒāĻŖā§ āĻāĻ āύ āĻā§°āĻž āĻĒā§ā§°āϤāĻŋāĻŦāĻŋāĻŽā§āĻŦ āϏāĻĻāĻžāϝāĻŧ āĻ’āϤ āĻšāϝāĻŧ ?
Ans: Behind the mirror | āĻāϤā§āϤ⧰: āĻĻā§°ā§āĻĒāĻŖā§° āĻĒāĻŋāĻāĻĢāĻžāϞ⧠- What is the sign of image distance for a virtual image ? āĻāĻžā§°ā§āĻā§ā§ąā§āϞ āĻĒā§ā§°āϤāĻŋāĻŦāĻŋāĻŽā§āĻŦā§° āĻŦāĻžāĻŦā§ āĻĒā§ā§°āϤāĻŋāĻŦāĻŋāĻŽā§āĻŦ āĻĻā§ā§°āϤā§āĻŦā§° āĻāĻŋāĻšā§āύ āĻāĻŋ ?
Ans: Positive | āĻāϤā§āϤ⧰: āϧāύāĻžāϤā§āĻŽāĻ - What is magnification if hi = ho ? hi = ho āĻšāϞ⧠āĻŦā§āĻĻā§āϧāĻŋ āĻāĻŋāĻŽāĻžāύ ?
Ans: 1 | āĻāϤā§āϤ⧰: 1 - Object at centre of curvature forms image where ? āĻŦāϏā§āϤ⧠āĻŦāĻā§ā§°āϤāĻžā§° āĻā§āύā§āĻĻā§ā§°āϤ āĻĨāĻžāĻāĻŋāϞ⧠āĻĒā§ā§°āϤāĻŋāĻŦāĻŋāĻŽā§āĻŦ āĻ’āϤ āĻāĻ āύ āĻšāϝāĻŧ ?
Ans: At centre of curvature | āĻāϤā§āϤ⧰: āĻŦāĻā§ā§°āϤāĻžā§° āĻā§āύā§āĻĻā§ā§°āϤā§āĻ - Which mirror diverges light ? āĻā§āύ āĻĻā§°ā§āĻĒāĻŖā§ āĻĒā§āĻšā§° āĻŦāĻŋāĻā§āĻā§ā§°āĻŖ āĻā§°ā§ ?
Ans: Convex mirror | āĻāϤā§āϤ⧰: āĻāϤā§āϤāϞ āĻĻā§°ā§āĻĒāĻŖ - What is the unit of magnification ? āĻŦā§āĻĻā§āϧāĻŋā§° āĻāĻāĻ āĻāĻŋ ?
Ans: No unit | āĻāϤā§āϤ⧰: āĻāĻāĻ āύāĻžāĻ - What happens to image size when object moves away from a concave mirror ? āĻ
ā§ąāϤāϞ āĻĻā§°ā§āĻĒāĻŖā§° āĻĒā§°āĻž āĻŦāϏā§āϤ⧠āĻāĻāϤ⧰āĻŋ āĻ’āϞ⧠āĻĒā§ā§°āϤāĻŋāĻŦāĻŋāĻŽā§āĻŦā§° āĻāĻāĻžā§° āĻāĻŋ āĻšāϝāĻŧ ?
Ans: Image becomes smaller | āĻāϤā§āϤ⧰: āĻĒā§ā§°āϤāĻŋāĻŦāĻŋāĻŽā§āĻŦ āϏ⧰⧠āĻšāϝāĻŧ - Which mirror is used as a shaving mirror ? āĻĻāĻžāĻĄāĻŧāĻŋ āĻāĻāĻž āĻĻā§°ā§āĻĒāĻŖ āĻšāĻŋāĻāĻžāĻĒā§ āĻā§āύāĻā§ āĻŦā§āĻ¯ā§ąāĻšāĻžā§° āĻā§°āĻž āĻšāϝāĻŧ ?
Ans: Concave mirror | āĻāϤā§āϤ⧰: āĻ ā§ąāϤāϞ āĻĻā§°ā§āĻĒāĻŖ - What type of image is formed when object is at focus of a concave mirror ? āĻ
ā§ąāϤāϞ āĻĻā§°ā§āĻĒāĻŖāϤ āĻŦāϏā§āϤ⧠āĻĢā§āĻāĻžāĻāϤ āĻĨāĻžāĻāĻŋāϞ⧠āĻāĻŋāĻĻā§°ā§ āĻĒā§ā§°āϤāĻŋāĻŦāĻŋāĻŽā§āĻŦ āĻāĻ āύ āĻšāϝāĻŧ ?
Ans: Image at infinity | āĻāϤā§āϤ⧰: āĻ āϏā§āĻŽāϤ āĻĒā§ā§°āϤāĻŋāĻŦāĻŋāĻŽā§āĻŦ - What is the aperture of a mirror ? āĻĻā§°ā§āĻĒāĻŖā§° āĻāĻĒāĻžā§°ā§āĻāĻžā§° āĻāĻŋ ?
Ans: Diameter of reflecting surface | āĻāϤā§āϤ⧰: āĻĒā§ā§°āϤāĻŋāĻĢāϞāĻŋāϤ āĻĒā§āώā§āĻ ā§° āĻŦā§āϝāĻžāϏ - Which mirror is used in security shops ? āύāĻŋāϰāĻžāĻĒāϤā§āϤāĻž āĻĻā§āĻāĻžāύāϤ āĻā§āύ āĻĻā§°ā§āĻĒāĻŖ āĻŦā§āĻ¯ā§ąāĻšāĻžā§° āĻā§°āĻž āĻšāϝāĻŧ ?
Ans: Convex mirror | āĻāϤā§āϤ⧰: āĻāϤā§āϤāϞ āĻĻā§°ā§āĻĒāĻŖ - Concave mirror forms a virtual image when object is placed where ? āĻ
ā§ąāϤāϞ āĻĻā§°ā§āĻĒāĻŖā§ āĻāĻžā§°ā§āĻā§ā§ąā§āϞ āĻĒā§ā§°āϤāĻŋāĻŦāĻŋāĻŽā§āĻŦ āĻā§āϤāĻŋāϝāĻŧāĻž āĻāĻ āύ āĻā§°ā§ ?
Ans: Between pole and focus | āĻāϤā§āϤ⧰: āĻĒ’āϞ āĻā§°ā§ āĻĢā§āĻāĻžāĻā§° āĻŽāĻžāĻāϤ - What is the sign of u for a real object ? āĻŦāĻžāϏā§āĻ¤ā§ą āĻŦāϏā§āϤā§ā§° āĻŦāĻžāĻŦā§ u ā§° āĻāĻŋāĻšā§āύ āĻāĻŋ ?
Ans: Negative | āĻāϤā§āϤ⧰: āĻāĻŖāĻžāϤā§āĻŽāĻ - Nature of image at infinity for a convex mirror ? āĻāϤā§āϤāϞ āĻĻā§°ā§āĻĒāĻŖāϤ āĻ
āϏā§āĻŽāϤ āĻāĻ āύ āĻšā§ā§ąāĻž āĻĒā§ā§°āϤāĻŋāĻŦāĻŋāĻŽā§āĻŦā§° āϏā§āĻŦāĻāĻžā§ą āĻāĻŋ ?
Ans: Virtual and diminished | āĻāϤā§āϤ⧰: āĻāĻžā§°ā§āĻā§ā§ąā§āϞ āĻā§°ā§ āϏ⧰⧠- Write the formula of radius of curvature. āĻŦāĻā§ā§°āϤāĻžā§° āĻŦā§āϝāĻžāϏāĻžā§°ā§āϧ⧰ āϏā§āϤā§ā§° āϞāĻŋāĻāĻžāĨ¤
Ans: R = 2f | āĻāϤā§āϤ⧰: R = 2f - Which mirror forms same size image at C ? C āϤ āĻāĻā§ āĻāĻāĻžā§°ā§° āĻĒā§ā§°āϤāĻŋāĻŦāĻŋāĻŽā§āĻŦ āĻā§āύ āĻĻā§°ā§āĻĒāĻŖā§ āĻāĻ āύ āĻā§°ā§ ?
Ans: Concave mirror | āĻāϤā§āϤ⧰: āĻ ā§ąāϤāϞ āĻĻā§°ā§āĻĒāĻŖ - What is a real image ? āĻŦāĻžāϏā§āĻ¤ā§ą āĻĒā§ā§°āϤāĻŋāĻŦāĻŋāĻŽā§āĻŦ āĻāĻŋ ?
Ans: Image formed on a screen | āĻāϤā§āϤ⧰: āĻĒā§°ā§āĻĻāĻžāϤ āĻāĻ āύ āĻšā§ā§ąāĻž āĻĒā§ā§°āϤāĻŋāĻŦāĻŋāĻŽā§āĻŦ - What is a virtual image ? āĻāĻžā§°ā§āĻā§ā§ąā§āϞ āĻĒā§ā§°āϤāĻŋāĻŦāĻŋāĻŽā§āĻŦ āĻāĻŋ ?
Ans: Image not formed on a screen | āĻāϤā§āϤ⧰: āĻĒā§°ā§āĻĻāĻžāϤ āύā§āĻšā§ā§ąāĻž āĻĒā§ā§°āϤāĻŋāĻŦāĻŋāĻŽā§āĻŦ - Which mirror is used in headlights ? āĻāĻžāĻĄāĻŧā§ā§° āĻšā§āĻĄāϞāĻžāĻāĻāϤ āĻā§āύ āĻĻā§°ā§āĻĒāĻŖ āĻŦā§āĻ¯ā§ąāĻšāĻžā§° āĻā§°āĻž āĻšāϝāĻŧ ?
Ans: Concave mirror | āĻāϤā§āϤ⧰: āĻ ā§ąāϤāϞ āĻĻā§°ā§āĻĒāĻŖ - If magnification (m) is positive, the image is ? m āϧāύāĻžāϤā§āĻŽāĻ āĻš’āϞ⧠āĻĒā§ā§°āϤāĻŋāĻŦāĻŋāĻŽā§āĻŦ āĻā§āύā§āĻā§ā§ąāĻž ?
Ans: Erect | āĻāϤā§āϤ⧰: āϏā§āĻāĻž - If magnification (m) is negative, the image is ? m āĻāĻŖāĻžāϤā§āĻŽāĻ āĻš’āϞ⧠āĻĒā§ā§°āϤāĻŋāĻŦāĻŋāĻŽā§āĻŦ āĻā§āύā§āĻā§ā§ąāĻž ?
Ans: Inverted | āĻāϤā§āϤ⧰: āĻāϞā§āĻāĻž - Position of image in a convex mirror for any object position ? āĻāϤā§āϤāϞ āĻĻā§°ā§āĻĒāĻŖāϤ āϝāĻŋāĻā§āύ⧠āĻŦāϏā§āϤā§ā§° āĻŦāĻžāĻŦā§ āĻĒā§ā§°āϤāĻŋāĻŦāĻŋāĻŽā§āĻŦā§° āĻ
ā§ąāϏā§āĻĨāĻžāύ āĻ’āϤ ?
Ans: Between pole and focus | āĻāϤā§āϤ⧰: āĻĒ’āϞ āĻā§°ā§ āĻĢā§āĻāĻžāĻā§° āĻŽāĻžāĻāϤ - What is the shape of reflecting surface of a spherical mirror ? āĻā§āϞāĻā§āϝāĻŧ āĻĻā§°ā§āĻĒāĻŖā§° āĻĒā§ā§°āϤāĻŋāĻĢāϞāĻŋāϤ āĻĒā§āώā§āĻ ā§° āĻāĻā§āϤāĻŋ āĻāĻŋ ?
Ans: Part of a sphere | āĻāϤā§āϤ⧰: āĻā§āϞ⧰ āĻ āĻāĻļ - Write the SI unit of radius of curvature. āĻŦāĻā§ā§°āϤāĻžā§° āĻŦā§āϝāĻžāϏāĻžā§°ā§āϧ⧰ SI āĻāĻāĻ āϞāĻŋāĻāĻžāĨ¤
Ans: metre (m) | āĻāϤā§āϤ⧰: āĻŽāĻŋāĻāĻžā§° (m)
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1. Define Pole of a Mirror
Pole is the centre of the reflecting surface of a spherical mirror. āĻĻā§°ā§āĻĒāĻŖā§° āĻĒā§ā§°āϤāĻŋāĻĢāϞāĻŋāϤ āĻĒā§āώā§āĻ ā§° āĻŽāĻžāĻāĻŦāĻŋāύā§āĻĻā§āĻ āĻĒ’āϞ āĻā§ā§ąāĻž āĻšāϝāĻŧāĨ¤
2. Define Principal Axis
The principal axis is the straight line passing through the pole and the centre of curvature of a mirror. āĻĒ’āϞ āĻā§°ā§ āĻŦāĻā§ā§°āϤāĻžā§° āĻā§āύā§āĻĻā§ā§°ā§° āĻŽāĻžāĻā§āĻĻāĻŋ āϝā§ā§ąāĻž āϏā§āĻāĻž ā§°ā§āĻāĻžāĻ āĻĒā§ā§°āϧāĻžāύ āĻ āĻā§āώ āĻā§ā§ąāĻž āĻšāϝāĻŧāĨ¤
3. Define Centre of Curvature
The centre of the sphere of which the mirror is a part is called centre of curvature.
āϝāĻŋ āĻā§āϞ⧰ āĻ āĻāĻļ āĻšāĻŋāĻāĻžāĻĒā§ āĻĻā§°ā§āĻĒāĻŖāĻā§ āĻāĻ āĻŋāϤ, āϏā§āĻ āĻā§āϞ⧰ āĻā§āύā§āĻĻā§ā§°āĻ āĻŦāĻā§ā§°āϤāĻžā§° āĻā§āύā§āĻĻā§ā§° āĻā§ā§ąāĻž āĻšāϝāĻŧāĨ¤
4. Define Focal Length
The distance between the pole and the principal focus of a mirror is called focal length.
āĻĒ’āϞ āĻā§°ā§ āĻĒā§ā§°āϧāĻžāύ āĻĢā§āĻāĻžāĻā§° āĻŽāĻžāĻā§° āĻĻā§ā§°āϤā§āĻŦāĻ āĻĢā§āĻāĻžāϞ āĻĻā§ā§°ā§āĻā§āϝ āĻā§ā§ąāĻž āĻšāϝāĻŧāĨ¤
5. Define Principal Focus of a Concave Mirror
The point where parallel rays of light meet after reflection from a concave mirror is called principal focus.
āϏāĻŽāĻžāύā§āϤ⧰āĻžāϞ āĻāϞ⧠⧰āĻļā§āĻŽāĻŋ āĻ ā§ąāϤāϞ āĻĻā§°ā§āĻĒāĻŖā§° āĻĒā§°āĻž āĻĒā§ā§°āϤāĻŋāĻĢāϞāĻŋāϤ āĻšā§ āϝ’āϤ āĻŽāĻŋāϞāĻŋāϤ āĻšāϝāĻŧ, āϤāĻžāĻ āĻĒā§ā§°āϧāĻžāύ āĻĢā§āĻāĻžāĻ āĻā§ā§ąāĻž āĻšāϝāĻŧāĨ¤
6. Define Principal Focus of a Convex Mirror
The point from which parallel rays appear to diverge after reflection is called principal focus.
āϏāĻŽāĻžāύā§āϤ⧰āĻžāϞ āĻāϞ⧠⧰āĻļā§āĻŽāĻŋ āĻāϤā§āϤāϞ āĻĻā§°ā§āĻĒāĻŖā§° āĻĒā§°āĻž āĻĒā§ā§°āϤāĻŋāĻĢāϞāĻŋāϤ āĻšā§ āϝ’ā§° āĻĒā§°āĻž āĻāϞāĻžāĻ āĻ āĻšāĻž āϝā§āύ āϞāĻžāĻā§, āϤāĻžāĻ āĻĒā§ā§°āϧāĻžāύ āĻĢā§āĻāĻžāĻ āĻā§ā§ąāĻž āĻšāϝāĻŧāĨ¤
7. Define Spherical Mirror
A mirror whose reflecting surface is part of a sphere is called a spherical mirror.
āĻā§āϞ⧰ āĻ āĻāĻļ āĻĨāĻāĻž āĻĒā§ā§°āϤāĻŋāĻĢāϞāĻŋāϤ āĻĒā§āώā§āĻ āϝā§āĻā§āϤ āĻĻā§°ā§āĻĒāĻŖāĻ āĻā§āϞāĻžāĻāĻžā§° āĻĻā§°ā§āĻĒāĻŖ āĻā§ā§ąāĻž āĻšāϝāĻŧāĨ¤
8. Define Image Distance
The distance between the image and the pole of the mirror is called image distance.
āĻĒā§ā§°āϤāĻŋāĻŦāĻŋāĻŽā§āĻŦ āĻā§°ā§ āĻĒ’āϞ⧰ āĻŽāĻžāĻā§° āĻĻā§ā§°āϤā§āĻŦāĻ āĻĒā§ā§°āϤāĻŋāĻŦāĻŋāĻŽā§āĻŦā§° āĻĻā§ā§°āϤā§āĻŦ āĻā§ā§ąāĻž āĻšāϝāĻŧāĨ¤
9. Define Object Distance
The distance between the object and the pole of the mirror is called object distance.
āĻŦāϏā§āϤ⧠āĻā§°ā§ āĻĒ’āϞ⧰ āĻŽāĻžāĻā§° āĻĻā§ā§°āϤā§āĻŦāĻ āĻŦāϏā§āϤā§ā§° āĻĻā§ā§°āϤā§āĻŦ āĻā§ā§ąāĻž āĻšāϝāĻŧāĨ¤
10. State Mirror Formula : āĻĻā§°ā§āĻĒāĻŖ āϏāĻŽā§āĻā§°āĻŖ
1/f = 1/v + 1/u