MHT-CET

Ray Optics and Optical Instruments question bank (Physics)

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Q1.

$A$ biconvex lens $(R_1 = R_2 = 30 \ cm)$ has a focal length equal to the focal length of a concave mirror. What is the radius of curvature of the concave mirror (in $cm$)? (Refractive index of the material of the lens $\mu = 1.6$)

(A)
$30$
(B)
$40$
(C)
$50$
(D)
$20$
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Q2.

For large magnifying power of a telescope, which of the following conditions is required?

(A)
The objective must be large.
(B)
The focal length of the objective must be large.
(C)
The focal length of the eyepiece must be large.
(D)
The focal lengths of both the objective and the eyepiece must be large.
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