Question

 Object PinConvex Lens Convex Mirror Image Pin 
 22.2 cm32.2  cm45.8 cm71.2 cm 

To find the focal length of a convex mirror, a student records the following data:
The focal length of the convex lens is and that of mirror is . Then taking index correction to be negligibly small, and are close to :

A

B

C

D

Hard
JEE Mains
Updated on : 2022-09-05
Solution
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Correct option is A)

Applying the lens equation, we get 

  ... (1)

For mirror, 


   .... (2)

Since there are 3 variables and only two equations (1) and (2) therefore only by substituting &  from options correct values can be verified.
Eliminating from the equation (1), we get a relation between and . This relation is satisfied only by option A.

Solve any question of Ray Optics and Optical Instrument with:-
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