Physics Crash Course MHT-CET>Chapter 19 - Ray Optics>Exercise 1>Q 272

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A transparent solid cylindrical rod has a refractive index of $\frac{2}{\sqrt{3}} .$ It is surrounded by air. A light ray is incident at the mid-point of one end of the rod as shown in the figure.

The incident angle $θ$ for which the light ray grazes along the wall of the rod is

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Important Questions on Ray Optics

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Physics Crash Course MHT-CET>Chapter 19 - Ray Optics>Exercise 1>Q 274

If the critical angle for total internal reflection from a medium to vacuum is

30 °,

the velocity of light in the medium is

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Physics Crash Course MHT-CET>Chapter 19 - Ray Optics>Exercise 1>Q 275

A ray falls on a prism $A B C, (A B = B C)$ and travels as shown in the figure. The minimum refractive index of the material of the prism should be

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Physics Crash Course MHT-CET>Chapter 19 - Ray Optics>Exercise 1>Q 277

The value of critical angle is least for which of the following colours of light?

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Physics Crash Course MHT-CET>Chapter 19 - Ray Optics>Exercise 1>Q 278

It is found that all electromagnetic signals sent from

P

towards

Q

reach point

R

. The speed of electromagnetic signals in glass cannot be

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Physics Crash Course MHT-CET>Chapter 19 - Ray Optics>Exercise 1>Q 279

The focal length of a lens depends upon

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Physics Crash Course MHT-CET>Chapter 19 - Ray Optics>Exercise 1>Q 283

A convex lens of focal length f produces a real image

3

times as that of size of the object, the distance between the object and the lens is

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Physics Crash Course MHT-CET>Chapter 19 - Ray Optics>Exercise 1>Q 284

When an object is kept in front of a convex lens, the distance between it and the real image is

54 cm

. If the magnification produced is

2

, the focal length of the lens is

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Physics Crash Course MHT-CET>Chapter 19 - Ray Optics>Exercise 1>Q 286

A plano-convex lens has focal length of

20 cm .

The radius of curvature of its spherical surface is

({}_{n}μ_{g} = 1.5)