GRADE 10 REFRACTION 1

Refraction

• is the bending of light at the surface of separation of two transparent media when light travels obliquely from one medium to another medium obliquely

• Refraction takes place in the second medium

• Refraction takes place in the first medium

• Refraction takes place at the surface of separation of two transparent media

• is the bending of light from a smooth and polished surface

ASSERTION (A) : Light bends towards the normal when travelling from optically rarer medium to optically denser medium.

REASON (R) : Speed of light is less in optically denser medium compared to optically rarer medium.

• A & R are correct and R is the correct explanation for A

• A & R are correct but R is not the correct explanation for A

• A is false but R is correct

• A is correct but R is false

• Both A and R are false

ASSERTION (A) : Light bends away from the normal when travelling from optically rarer medium to optically denser medium.

REASON (R) : Speed of light is less in optically denser medium compared to optically rarer medium.

• A & R are correct and R is the correct explanation for A

• A & R are correct but R is not the correct explanation for A

• A is false but R is correct

• A is correct but R is false

• Both A and R are false

ASSERTION (A) : Light bends away from the normal when travelling from optically denser medium to optically rarer medium.

REASON (R) : Speed of light is more in optically rarer medium compared to optically denser medium.

• A & R are correct and R is the correct explanation for A

• A & R are correct but R is not the correct explanation for A

• A is false but R is correct

• A is correct but R is false

• Both A and R are false

ASSERTION (A) : Light bends towards the normal when travelling from optically denser medium to optically rarer medium.

REASON (R) : Speed of light is more in optically rarer medium compared to optically denser medium.

• A & R are correct and R is the correct explanation for A

• A & R are correct but R is not the correct explanation for A

• A is false but R is correct

• A is correct but R is false

• Both A and R are false

When light ray is incident along the normal on a transparent medium,

• angle of incidence = 0

• angle of refraction = 0

• light ray goes straight without any refraction

• light ray bends towards the normal

• light ray bends away from the normal

Speed of light in vacuum is

• 2 x 10⁸ m/s

• 3 x 10⁸ m/s

• 2 x 10⁸ km/s

• 3 x 10⁸ km/s

• 1 x 10⁸ m/s

For refraction,

• angle of incidence is the angle between the incident ray and the normal

• angle of refraction is the angle between the refracted ray and the normal

• angle of deviation is the angle between the incident ray and the refracted ray

• angle of refraction is the angle between the incident ray and the normal

• angle of incidence is the angle between the incident ray and the refracted ray

ASSERTION (A) : During refraction from optically denser to optically rarer medium, angle of refraction < angle of incidence

REASON (R) : Light bends towards the normal when travelling from optically denser medium to optically rarer medium.

• A & R are correct and R is the correct explanation for A

• A & R are correct but R is not the correct explanation for A

• A is false but R is correct

• A is correct but R is false

• Both A and R are false

ASSERTION (A) : During refraction from optically rarer to optically denser medium, angle of refraction < angle of incidence

REASON (R) : Light bends towards the normal when travelling from optically rarer medium to optically denser medium.

• A & R are correct and R is the correct explanation for A

• A & R are correct but R is not the correct explanation for A

• A is false but R is correct

• A is correct but R is false

• Both A and R are false