MHT CET 2021 23rd September Evening Shift | Ray Optics Question 70 | Physics

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

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

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

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

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

MHT CET 2021 23th September Morning Shift

MCQ (Single Correct Answer)

-0

The magnifying power of a refracting type of astronomical telescope is '$$\mathrm{m}$$'. If focal length of eyepiece is doubled then the magnifying power will become

$$2 \mathrm{~m}$$

$$\frac{m}{2}$$

$$\frac{\mathrm{m}}{4}$$

MHT CET 2021 23th September Morning Shift

MCQ (Single Correct Answer)

-0

A ray of light travels from air to water to glass and again from glass to air. Refractive index of water w.r.t. air is 'X', glass w.r.t. water is 'Y' and air w.r.t. glass is 'Z'. Which one of the following is correct?

YZ = X

XYZ = 1

XY = Z

XZ = Y

MHT CET 2021 22th September Evening Shift

MCQ (Single Correct Answer)

-0

An object is located on a wall, its image of equal size is to be obtained on a parallel wall with the help of a convex lens. The lens is placed at a distance '$$\mathrm{d}$$' in front of the second wall. The required focal length of the lens is

less than $$\frac{d}{4}$$

only $$\frac{\mathrm{d}}{4}$$

(more than $$\frac{d}{4}$$ but less than $$\frac{d}{2}$$

only $$\frac{d}{2}$$

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