ICSE.X.PHYSICS. 4. REFRACTION OF LIGHT AT PLANE SURFACES

Light enters from air into glass having refractive index 1.5. If the speed of light in vacuum is 3 x 10⁸ m s^-1, find the speed of light in glass.

• 2 x 10⁸ m s^-1

• 2.5 x 10⁸ m s^-1.

• 1.5 x 10⁸ m s^-1.

• 3 x 10⁸ m s^-1.

Light of wavelength 500 nm in air enters a glass plate of refractive index 1.5. Find the wavelength of light in glass.

• 3.33 x 10^-7 m.

• 2.50 x 10^-7 m.

• 4.00 x 10^-7 m.

• 1.67 x 10^-7 m.

The refractive index of water is 4/3 and for glass is 3/2 with respect to air.What would be the refractive index of glass with respect to water?

• 9/8

• 4/3

• 3/2

• 5/4

With respect to air, the refractive indices of water and benzene are 1.33 and 1.50, respectively. Find the refractive index of benzene with respect to water.

• 1.13

• 1.10

• 1.20

• 1.25

The velocity of light in diamond is 121,000 km/s. Find its refractive index. (Velocity of light in vacuum = 3×10⁸ m/s).

• 2.48

• 1.33

• 1.52

• 2.25

The angle of incidence in air for a ray of light is 40°. If the ray travels through water having refractive index 4/3, find the angle of refraction.

• 28.82°

• 30°

• 32°

• 35°

The speed of light in air is 3 × 10⁸ m s^–1. In medium X, its speed is 2 × 10⁸ m s^–1 and in medium Y, the speed of light is 2.5 × 10 m s^–1. Find the refractive index of Y with respect to X.

• 4/5

• 3/5

• 5/4

• 5/3

A coin is placed at a depth of 15 cm in a beaker containing water. The refractive index of water is 4/3. Calculate the height through which the image of the coin is raised.

• 3.25 cm.

• 2.5 cm.

• 4.0 cm.

• 3.75cm.

The depth of water in a bucket is 40 cm but its bottom appears to be raised by 10 cm. Find the refractive index of water.

• 1.33

• 1.25

• 1.50

• 1.40

A small air bubble in a glass slab appears to be 2.4 cm from the surface. Find the real depth of the bubble, if the refractive index of glass is 1.5.

• 3.6 cm.

• 2.8 cm.

• 3.0 cm.

• 3.2 cm.