Concave Mirror â Basic Shape (āĻ ā§ąāĻ¤āĻ˛ āĻĻāĻžāĻĒā§āĻ¨ â āĻŽā§āĻ˛āĻŋāĻ āĻāĻā§āĻ¤āĻŋ)
- A concave mirror is curved inward. āĻ
ā§ąāĻ¤āĻ˛ āĻĻāĻžāĻĒā§āĻ¨ āĻāĻŋāĻ¤ā§°āĻĢāĻžāĻ˛ā§ āĻŦāĻžāĻāĻāĻž āĻšāĻ¯āĻŧāĨ¤
- Its reflecting surface lies on the inner side. āĻāĻ¯āĻŧāĻžā§° āĻĒā§ā§°āĻ¤āĻŋāĻĢāĻ˛āĻ āĻĒā§āĻˇā§āĻ āĻāĻŋāĻ¤ā§°āĻĢāĻžāĻ˛ā§ āĻĨāĻžāĻā§āĨ¤
- It is also called a converging mirror because it brings parallel rays together at the principal focus. āĻāĻ¯āĻŧāĻžāĻ āĻ āĻāĻŋāĻ¸āĻžā§°ā§ āĻĻāĻžāĻĒā§āĻ¨ (Converging Mirror) āĻŦā§āĻ˛āĻŋāĻ āĻā§ā§ąāĻž āĻšāĻ¯āĻŧ, āĻāĻžā§°āĻŖ āĻ āĻ¸āĻŽāĻžāĻ¨ā§āĻ¤ā§°āĻžāĻ˛ āĻāĻŋā§°āĻŖāĻ¸āĻŽā§āĻšāĻ āĻŽā§āĻā§āĻ¯ āĻĢ'āĻāĻžāĻāĻ¤ āĻāĻāĻ¤ā§ā§°āĻŋāĻ¤ āĻā§°ā§āĨ¤
MCQs
1. A concave mirror is curved: āĻ ā§ąāĻ¤āĻ˛ āĻĻāĻžāĻĒā§āĻ¨ āĻā§āĻ¨ā§āĻĻā§°ā§ āĻŦāĻžāĻāĻāĻž āĻšāĻ¯āĻŧ ?
A) Outward | B) Inward | C) Flat | D) Wavy
Ans: B) Inward
Explanation: A concave mirror has an inward-curved reflecting surface. āĻŦā§āĻ¯āĻžāĻā§āĻ¯āĻž: āĻ ā§ąāĻ¤āĻ˛ āĻĻāĻžāĻĒā§āĻ¨ā§° āĻĒā§ā§°āĻ¤āĻŋāĻĢāĻ˛āĻ āĻĒā§āĻˇā§āĻ āĻāĻŋāĻ¤ā§°āĻĢāĻžāĻ˛ā§ āĻŦāĻžāĻāĻāĻž āĻĨāĻžāĻā§āĨ¤
2. The reflecting surface of a concave mirror lies on the: āĻ ā§ąāĻ¤āĻ˛ āĻĻāĻžāĻĒā§āĻ¨ā§° āĻĒā§ā§°āĻ¤āĻŋāĻĢāĻ˛āĻ āĻĒā§āĻˇā§āĻ āĻ'āĻ¤ āĻĨāĻžāĻā§ ?
A) Outer side | B) Inner side | C) Both sides | D) Centre
Ans: B) Inner side
Explanation: The reflecting surface of a concave mirror is on the inner curved side. āĻŦā§āĻ¯āĻžāĻā§āĻ¯āĻž: āĻ ā§ąāĻ¤āĻ˛ āĻĻāĻžāĻĒā§āĻ¨ā§° āĻĒā§ā§°āĻ¤āĻŋāĻĢāĻ˛āĻ āĻĒā§āĻˇā§āĻ āĻāĻŋāĻ¤ā§°āĻĢāĻžāĻ˛ā§ āĻŦāĻžāĻāĻāĻž āĻ āĻāĻļāĻ¤ āĻĨāĻžāĻā§āĨ¤
3. A concave mirror is also known as a: āĻ ā§ąāĻ¤āĻ˛ āĻĻāĻžāĻĒā§āĻ¨āĻ āĻāĻ¨ āĻāĻŋ āĻ¨āĻžāĻŽā§ā§°ā§ āĻāĻ¨āĻž āĻ¯āĻžāĻ¯?
A) Diverging Mirror | B) Converging Mirror | C) Plane Mirror | D) Virtual Mirror
Ans: B) Converging Mirror
Explanation: A concave mirror converges parallel rays to the principal focus. āĻŦā§āĻ¯āĻžāĻā§āĻ¯āĻž: āĻ ā§ąāĻ¤āĻ˛ āĻĻāĻžāĻĒā§āĻ¨ā§ āĻ¸āĻŽāĻžāĻ¨ā§āĻ¤ā§°āĻžāĻ˛ āĻāĻŋā§°āĻŖāĻ¸āĻŽā§āĻšāĻ āĻŽā§āĻā§āĻ¯ āĻĢ'āĻāĻžāĻāĻ¤ āĻāĻāĻ¤ā§ā§°āĻŋāĻ¤ āĻā§°ā§āĨ¤ āĻ¸ā§āĻ¯āĻŧā§āĻšā§ āĻāĻ¯āĻŧāĻžāĻ āĻ āĻāĻŋāĻ¸āĻžā§°ā§ āĻĻāĻžāĻĒā§āĻ¨ āĻŦā§āĻ˛āĻž āĻšāĻ¯āĻŧāĨ¤
4. Which of the following statements is correct about a concave mirror ? āĻ ā§ąāĻ¤āĻ˛ āĻĻāĻžāĻĒā§āĻ¨ā§° āĻŦāĻŋāĻˇāĻ¯āĻŧā§ āĻ¤āĻ˛ā§° āĻā§āĻ¨āĻā§ āĻāĻā§āĻ¤āĻŋ āĻ¸āĻ āĻŋāĻ ?
A) It is curved outward. | B) It is a diverging mirror. | C) Its reflecting surface lies on the inner side. | D) Its reflecting surface is flat.
Ans: C) Its reflecting surface lies on the inner side.
Explanation: A concave mirror has an inward-curved reflecting surface on the inner side and acts as a converging mirror. āĻŦā§āĻ¯āĻžāĻā§āĻ¯āĻž: āĻ ā§ąāĻ¤āĻ˛ āĻĻāĻžāĻĒā§āĻ¨ā§° āĻĒā§ā§°āĻ¤āĻŋāĻĢāĻ˛āĻ āĻĒā§āĻˇā§āĻ āĻāĻŋāĻ¤ā§°āĻĢāĻžāĻ˛ā§ āĻĨāĻžāĻā§ āĻā§°ā§ āĻ āĻāĻāĻž āĻ āĻāĻŋāĻ¸āĻžā§°ā§ āĻĻāĻžāĻĒā§āĻ¨āĨ¤
5. Which type of mirror converges parallel rays ? āĻā§āĻ¨ āĻ§ā§°āĻŖā§° āĻĻāĻžāĻĒā§āĻ¨ā§ āĻ¸āĻŽāĻžāĻ¨ā§āĻ¤ā§°āĻžāĻ˛ āĻāĻŋā§°āĻŖāĻ¸āĻŽā§āĻšāĻ āĻāĻāĻ¤ā§ā§°āĻŋāĻ¤ āĻā§°ā§ ?
A) Plane Mirror | B) Concave Mirror | C) Convex Mirror | D) None of these
Ans: B) Concave Mirror
Explanation: A concave mirror converges parallel rays at the principal focus. āĻŦā§āĻ¯āĻžāĻā§āĻ¯āĻž: āĻ ā§ąāĻ¤āĻ˛ āĻĻāĻžāĻĒā§āĻ¨ā§ āĻ¸āĻŽāĻžāĻ¨ā§āĻ¤ā§°āĻžāĻ˛ āĻāĻŋā§°āĻŖāĻ¸āĻŽā§āĻšāĻ āĻŽā§āĻā§āĻ¯ āĻĢ'āĻāĻžāĻāĻ¤ āĻāĻāĻ¤ā§ā§°āĻŋāĻ¤ āĻā§°ā§āĨ¤
Trick : Concave Mirror = Inward + Inner Surface + Converging Mirror (āĻ ā§ąāĻ¤āĻ˛ āĻĻāĻžāĻĒā§āĻ¨ = āĻāĻŋāĻ¤ā§°āĻĢāĻžāĻ˛ā§ āĻŦāĻžāĻāĻāĻž + āĻāĻŋāĻ¤ā§°āĻĢāĻžāĻ˛ā§ āĻĒā§ā§°āĻ¤āĻŋāĻĢāĻ˛āĻ āĻĒā§āĻˇā§āĻ + āĻ āĻāĻŋāĻ¸āĻžā§°ā§ āĻĻāĻžāĻĒā§āĻ¨)