MHT CET 2021 24th September Morning Shift | Ray Optics Question 67 | Physics

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

$$\frac{1}{2}, 2$$

$$2 \mathrm{f}, \frac{\mathrm{P}}{2}$$

$$\sqrt{\frac{2}{f}}, \sqrt{\frac{P}{2}}$$

$$\frac{2 \mathrm{f}}{3}, \frac{2}{3} \mathrm{P}$$

MHT CET 2021 24th September Morning Shift

MCQ (Single Correct Answer)

-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

$$\sin ^{-1}\left(\frac{1}{\sqrt{\mu}}\right)$$

$$\sin ^{-1}\left(\frac{1}{\mu}\right)$$

$$\sin ^{-1}\left(\frac{1}{\mu^2}\right)$$

$$90^{\circ}$$

MHT CET 2021 23rd September Evening Shift

MCQ (Single Correct Answer)

-0

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

Distortion

Coma

Astigmatism

Spherical aberration

MHT CET 2021 23rd September Evening Shift

MCQ (Single Correct Answer)

-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

$$\frac{\mathrm{R}}{\mu_1-\mu_2}$$

$$\frac{R}{2\left(\mu_1+\mu_2\right)}$$

$$\frac{2 R}{\mu_1-\mu_2}$$

$$\frac{\mathrm{R}}{2\left(\mu_1-\mu_2\right)}$$

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