Light-MCQ

Bending of light when it enters obliquely from one medium to another is

• Reflection of light

• Dispersion of light

• Scattering of light

• Refraction of light

When a ray of light goes from one medium to another, there is

• A change in its speed as well as direction

• No change in speed and direction

• A change in speed but no change in direction

• A change in direction but speed remains constant

The ratio of the speed of light in vacuum to its speed in a specific medium

• Magnification produced by lens

• Magnification produced by mirror

• Refractive index of that medium

• None of the above

Find out the refractive index of the medium such that the speed of light in the medium is 2X10⁸ m/s?

• 1

• 2

• 1.5 m/s

• 1.5

Calculate the speed of light in water of refractive index 4/3.Given speed of light in air=3X10⁸ m/s

• 1.25X10⁸ m/s

• 2.25X10⁸ m/s

• 2.25X10⁵ m/s

• 1.25X10⁵ m/s

A light ray enters from medium A to medium B as shown in the figure. The refractive index of medium B relative to A will be:

• Greater than unity

• Less than unity

• Equal to unity

• zero

Figure shows a ray of light as it travels from medium A to medium B. Refractive index of the medium B relative to medium A is

• $\sqrt{\frac{3}{2}}$

• $\sqrt{\frac{2}{3}}$

• $\frac{1}{\sqrt{2}}$

• $\sqrt{2}$

Total number of centre of curvature in spherical lenses

• 2

• 3

• 4

• None

The diagrams showing the correct path of the ray

• II and III only

• I and II only

• I, II and III only

• I, II and IV

Observe the following incomplete ray diagram of an object.The image A'B' is shown.

a)The position of object AB would have been----------

b)Size of the object would have been ----------- than the size of the image.

• At F1, smaller

• At 2F1, greater

• Infinity, smaller

• Beyond 2F1, bigger