A ray of light falls on the surface of water μ w a = 4 3 at angle of incidence 45 ° . What is the angle of refraction for this ray?

Refractive index of water with respect to air, μ w a = μ w μ a = 4 3 . Since refractive of air i.e μ a = 1 . . Angle of incidence, i = 45 ° . According to Snell's laws, the refractive index of a medium is given by, μ w a = s i n i s i n r . ∴ 4 3 = sin 45 ° sin r . ∴ sin r = sin 45 ° 4 3 . Thus, sin r = 1 2 4 3 ∴ sin r = 1 2 × 3 4 = 0 . 707 × 0 . 75 = 0 . 53 ≈ 1 2 . ∴ r = sin - 1 1 2 = 30 ° . Hence, the angle of refraction is approximately equal to 30 °

E M B I B E

S CHAND'S ICSE PHYSICS BOOK 2>Chapter 4 - Refraction at Plane Surfaces>QUESTIONS>Q 16

EASY

10th ICSE

IMPORTANT

Earn 100

State the laws of refraction.

Important Questions on Refraction at Plane Surfaces

MEDIUM

10th ICSE

IMPORTANT

S CHAND'S ICSE PHYSICS BOOK 2>Chapter 4 - Refraction at Plane Surfaces>QUESTIONS>Q 17

A light ray is moving from air to a denser medium such that values of angle of incidence and angle of refraction are

60^{0}

and

45^{0}

respectively. What is the absolute refractive index of this medium?

HARD

10th ICSE

IMPORTANT

S CHAND'S ICSE PHYSICS BOOK 2>Chapter 4 - Refraction at Plane Surfaces>QUESTIONS>Q 18

A ray of light falls on the surface of water

({}_{a}μ_{w} = \frac{4}{3})

at angle of incidence

45^{°}

. What is the angle of refraction for this ray?

EASY

10th ICSE

IMPORTANT

S CHAND'S ICSE PHYSICS BOOK 2>Chapter 4 - Refraction at Plane Surfaces>QUESTIONS>Q 19

State the principle of reversibility.

MEDIUM

10th ICSE

IMPORTANT

S CHAND'S ICSE PHYSICS BOOK 2>Chapter 4 - Refraction at Plane Surfaces>QUESTIONS>Q 20

A light ray moves from water to diamond. What is refractive index of diamond with respect to water. Given refractive index of water with respect to air i.e

{}_{a}μ_{w} = 1.33

and refractive index of diamond with respect to air i.e

{}_{a}μ_{d} = 2.4

.

HARD

10th ICSE

IMPORTANT

S CHAND'S ICSE PHYSICS BOOK 2>Chapter 4 - Refraction at Plane Surfaces>QUESTIONS>Q 21

Describe how you will prove the laws of refraction experimentally.

MEDIUM

10th ICSE

IMPORTANT

S CHAND'S ICSE PHYSICS BOOK 2>Chapter 4 - Refraction at Plane Surfaces>QUESTIONS>Q 22

The lower surface of a rectangular glass block is silvered. As shown in the figure, a light ray falls obliquely on the upper surface of this glass block. Complete the ray diagram.

Question Image

MEDIUM

10th ICSE

IMPORTANT

S CHAND'S ICSE PHYSICS BOOK 2>Chapter 4 - Refraction at Plane Surfaces>QUESTIONS>Q 23

Explain the term lateral displacement of a light ray when it passes through a rectangular glass block. State the factors on which lateral displacement depends.

MEDIUM

10th ICSE

IMPORTANT

S CHAND'S ICSE PHYSICS BOOK 2>Chapter 4 - Refraction at Plane Surfaces>QUESTIONS>Q 24

Draw a neat ray diagram to explain that second image of an object from a thick glass mirror is brightest.