Why does diamong sparkle?

The diamond has a very high refractive index 2 . 45 and hence low critical angle (about 24 ° ) Apart from this, it is cut in a special manner so that most of the light incident on it any internal faces have a higher angle of incidence than its critical angle This makes the light suffers multiple internal reflections from its inner faces. This makes the diamond shine.

E M B I B E

Gamma Question Bank for Medical Physics>Chapter 26 - Ray Optics and Optical Instruments>EXERCISE>Q 13

HARD

NEET

IMPORTANT

Earn 100

A small object is placed $20 cm$ in front of a block of glass $10 cm$ thick and its farther side silvered. The image is formed $22 cm$ behind the silvered face. Find the refractive index of glass.

50% studentsanswered this correctly

Important Questions on Ray Optics and Optical Instruments

MEDIUM

NEET

IMPORTANT

Gamma Question Bank for Medical Physics>Chapter 26 - Ray Optics and Optical Instruments>EXERCISE>Q 14

A glass slab of thickness

4 cm

contains the same numbers of waves as

5 cm

of water when both are traversed by the same monochromatic ray of light. The refractive index of water is

\frac{4}{3}

, what is that for glass?

MEDIUM

NEET

IMPORTANT

Gamma Question Bank for Medical Physics>Chapter 26 - Ray Optics and Optical Instruments>EXERCISE>Q 15

Light travels with velocities

2 \times 10^{8} m s^{- 1}

and

2.5 \times 10^{8} m s^{- 1}

through two different media. The critical angle of the two media is

EASY

NEET

IMPORTANT

Gamma Question Bank for Medical Physics>Chapter 26 - Ray Optics and Optical Instruments>EXERCISE>Q 16

Light takes

t_{1}

second to travel a distance

x

in vacuum and the same light takes

t_{2}

second to travel

10 x cm

in a medium. Critical angle for corresponding medium will be

MEDIUM

NEET

IMPORTANT

Gamma Question Bank for Medical Physics>Chapter 26 - Ray Optics and Optical Instruments>EXERCISE>Q 17

A fish is a little away below the surface of a take. If the critical angle is

49 °,

then the fish could see things above the water surface within an angular range of

MEDIUM

NEET

IMPORTANT

Gamma Question Bank for Medical Physics>Chapter 26 - Ray Optics and Optical Instruments>EXERCISE>Q 18

A parallel beam of monochromatic light falls on a combination of a convex lens and a concave lens of focal lengths

15 cm

and

5 cm

respectively. What is the distance between the two lenses to obtain a parallel beam of light from the concave lens?

EASY

NEET

IMPORTANT

Gamma Question Bank for Medical Physics>Chapter 26 - Ray Optics and Optical Instruments>EXERCISE>Q 19

Three lenses in contact have a combined focal length of

12 cm .

When the third lens is removed, the combined focal length is

\frac{60}{7} cm .

The third lens is

MEDIUM

NEET

IMPORTANT

Gamma Question Bank for Medical Physics>Chapter 26 - Ray Optics and Optical Instruments>EXERCISE>Q 20

The radii of curvatures of a convex lens are

0.04 m

and

0.04 m .

Its refractive index is

1.5 .

Its focal length is

EASY

NEET

IMPORTANT

Gamma Question Bank for Medical Physics>Chapter 26 - Ray Optics and Optical Instruments>EXERCISE>Q 21

A convex glass lens $(μ_{g} = 1.5)$ has a focal length of $8 cm$ when placed in air. What is the focal length of the lens when it is immersed in water? $(μ_{w} = \frac{4}{3})$