The refractive index of air with respect to glass is expressed as g μ a = sin i sin r . Write down a similar expression for a μ g in terms of the angles i and r .

Here, i represents the angle of incidence which is the angle between the incident ray and normal. r represents the angle of refraction which is the angle between the refracted ray and normal. The refractive index of the second medium with respect to the first medium is defined as the ratio of the sine of the angle of incidence in the first medium to the sine of the angle of refraction in the second medium. The refractive index of glass with respect to air is given as, a μ g = sin r sin i

The refractive index of air with respect to glass is expressed as μ a g = sin i sin r . If angle r is given as 90 ° , then find that what the corresponding angle i called and it will be equal to what?

In the given question above, the refractive index of air with respect to glass is given as μ a g = sin i sin r . We are asked that if the refractive angle, r = 90 ° , then the corresponding angle of incidence, i will be equal to what. So, if the refractive angle, r = 90 ° , then the corresponding angle of incidence, i will be equal to the critical angle.

E M B I B E

Selina Icse Concise Physics For Class 10>Chapter 4 - Refraction of Light at Plane Surfaces>EXERCISE-4(D)>Q 6

EASY

10th ICSE

IMPORTANT

Earn 100

Name two factors which affect the critical angle for a given pair of media. State how do the factors affect it.

Important Questions on Refraction of Light at Plane Surfaces

EASY

10th ICSE

IMPORTANT

Selina Icse Concise Physics For Class 10>Chapter 4 - Refraction of Light at Plane Surfaces>EXERCISE-4(D)>Q 7

The critical angle for glass-air is

45 °

for the light of yellow colour. State whether it will be less than, equal to, or more than

45 °

for red light.

EASY

10th ICSE

IMPORTANT

Selina Icse Concise Physics For Class 10>Chapter 4 - Refraction of Light at Plane Surfaces>EXERCISE-4(D)>Q 7

The critical angle for glass-air is

45 °

for the light of yellow colour. State whether it will be less than, equal to, or more than

45 °

for blue light.

EASY

10th ICSE

IMPORTANT

Selina Icse Concise Physics For Class 10>Chapter 4 - Refraction of Light at Plane Surfaces>EXERCISE-4(D)>Q 8

What is total internal reflection?

EASY

10th ICSE

IMPORTANT

Selina Icse Concise Physics For Class 10>Chapter 4 - Refraction of Light at Plane Surfaces>EXERCISE-4(D)>Q 8

State two conditions necessary for total internal reflection to occur.

MEDIUM

10th ICSE

IMPORTANT

Selina Icse Concise Physics For Class 10>Chapter 4 - Refraction of Light at Plane Surfaces>EXERCISE-4(D)>Q 8

Draw diagrams to illustrate the total internal reflection.

EASY

10th ICSE

IMPORTANT

Selina Icse Concise Physics For Class 10>Chapter 4 - Refraction of Light at Plane Surfaces>EXERCISE-4(D)>Q 10

State whether the following statement is true or false:

If the angle of incidence is greater than the critical angle, light is not refracted at all, when it falls on the surface from a denser medium to a rarer medium.

EASY

10th ICSE

IMPORTANT

Selina Icse Concise Physics For Class 10>Chapter 4 - Refraction of Light at Plane Surfaces>EXERCISE-4(D)>Q 11

The refractive index of air with respect to glass is expressed as

$_{g} μ_{a} = \frac{\sin i}{\sin r}$ .

Write down a similar expression for $_{a} μ_{g}$ in terms of the angles $i$ and $r$ .

MEDIUM

10th ICSE

IMPORTANT

Selina Icse Concise Physics For Class 10>Chapter 4 - Refraction of Light at Plane Surfaces>EXERCISE-4(D)>Q 11

The refractive index of air with respect to glass is expressed as ${}_{g}μ_{a} = \frac{\sin i}{\sin r }$ . If angle r is given as $90 °$ , then find that what the corresponding angle $i$ called and it will be equal to what?

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