Light

Question 1

Define refraction of light

Answer 1

The change in the direction of path of light when it passes from one transparent medium to another transparent medium is called refraction

Question 2

State the laws of refraction

Answer 2

The incident ray the refracted Ray and the normal at the point of incidence all lie in the same plane the ratio of the sign of angle of incidence I to the sign of angle of R is constant for the pair given the media

Question 3

What is a refractive index

Answer 3

The refractive index of second medium with respect to the first medium is defined as the ratio of the sign of angle of incidence in the first medium to the sign of angle of refraction in the second medium

Question 4

Represent the refractive index of a medium 2 respect to medium 1

Answer 4

1U2

Question 5

State the principle of reversibility

Answer 5

1u2 x 2u1 =1

Question 6

State the factors that affect lateral displatement of light

Answer 6

The thickness of the medium the angle of incidence the refractive index

Question 7

How does the angle of incidence affect the lateral displacement

Answer 7

More the angle of incident more the lateral displacement

Question 8

How does wavelength affect lateral displacement

Answer 8

Since refractive index increases with the decrease in wavelength of light so lateral displacement increases with the decrease in wavelength of light

Question 9

Violet light and red light which one has more lateral displacement

Answer 9

Violet light has more lateral displacement

Question 10

How how is angle of deviation affected by angle of incidence

Answer 10

With the increase in angle of incident the angle of deviation starts to decrease till it reaches a certain angle of incidence where it starts to increase

Question 11

When is the angle of deviation the least

Answer 11

Angle of deviation is the least when the angle of incidence is equals to the angle of emergence

Question 12

How does Critical Angle effect the angle of incidence moving from a denture medium to rare medium

Answer 12

Is the angle of incidence is less than the critical angle then the incident grey gets refracted is the angle of incidence is equals to Critical Angle then the angle of incidence is parallel to the 90 degree of the normal is the angle of incidence is greater than the critical angle then total reflection takes place

Question 13

Define real and Apparent depth

Answer 13

An object placed in a denture medium when viewed from a rare medium appears to be at a depth lesser than its real death this is because of refraction of light

Question 14

The mathematical formula relating real depth and

Answer 14

A u m is equals to real depth by Apparent depth

Question 15

Relationship between critical angle and the refractive index

Answer 15

gUa = sin c / sin 90⁰

Sin 90⁰ = 1

Therefore, gUa =sin c

Question 16

Factors affecting the critical angle

Answer 16

Independence upon the colour of light it depends on the temperature

Question 17

Define total internal reflection

Answer 17

When light Ray Travelling in a denser medium is incident at the surface of the rear or medium At an angle of incidence greater than the critical angle For the pair of media the ray is totally reflected back into the denser medium this phenomena is called the total internal deflection

Question 18

What are the essential conditions for total internal

Answer 18

The light must travel from denser to rare medium the angle of incidence must be greater than the critical angle for the pair of media

Question 19

What is critical angle

Answer 19

Critical angle is the angle of incidence in the denser medium corresponding to which the angle of refraction being 90 degree in the rare medium

Question 20

State the formula for linear magnification

Answer 20

M is equals to V by U

Question 21

State the lens formula

Answer 21

1/v - 1/u = 1/f

Question 22

State the magnifying power formula and its

Answer 22

Magnifying power = 1 +D/f

Question 23

State the formula for power of lens and the units its

Answer 23

Power is equals to 1 by focal length in metre power is measured in diopter

Question 24

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