1
MHT CET 2021 24th September Morning Shift
MCQ (Single Correct Answer)
+1
-0

The radii of curvature of both the surfaces of a convex lens of focal length '$$\mathrm{f}$$' and focal power '$$\mathrm{P}$$' are equal. One of the surfaces is made plane by grinding. The new focal length and focal power of the lens is respectively

A
$$\frac{1}{2}, 2$$
B
$$2 \mathrm{f}, \frac{\mathrm{P}}{2}$$
C
$$\sqrt{\frac{2}{f}}, \sqrt{\frac{P}{2}}$$
D
$$\frac{2 \mathrm{f}}{3}, \frac{2}{3} \mathrm{P}$$
2
MHT CET 2021 24th September Morning Shift
MCQ (Single Correct Answer)
+1
-0

A glass slab has refractive index '$$\mu$$' with respect to air and the critical angle for a ray of light in going from glass to glass to air is '$$\theta$$' If a ray of light is incident from air on the glass with angle of incidence '$$\theta$$', then the corresponding angle of refraction is

A
$$\sin ^{-1}\left(\frac{1}{\sqrt{\mu}}\right)$$
B
$$\sin ^{-1}\left(\frac{1}{\mu}\right)$$
C
$$\sin ^{-1}\left(\frac{1}{\mu^2}\right)$$
D
$$90^{\circ}$$
3
MHT CET 2021 23rd September Evening Shift
MCQ (Single Correct Answer)
+1
-0

'Circle of least confusion' refers to which one of the following defects occurring in images formed by mirrors or lenses?

A
Distortion
B
Coma
C
Astigmatism
D
Spherical aberration
4
MHT CET 2021 23rd September Evening Shift
MCQ (Single Correct Answer)
+1
-0

A plano-convex lens of refractive index ($$\mu_1^{\prime}$$ fits exactly into a plano-concave lens of refractive index $$\mu_2$$. Their plane surface are parallel to each other. 'R' is the radius of curvature of the curved surface of the lenses. The focal length of the combination is

A
$$\frac{\mathrm{R}}{\mu_1-\mu_2}$$
B
$$\frac{R}{2\left(\mu_1+\mu_2\right)}$$
C
$$\frac{2 R}{\mu_1-\mu_2}$$
D
$$\frac{\mathrm{R}}{2\left(\mu_1-\mu_2\right)}$$
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