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
Verified by Toppr
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.

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