Question

1.If i and r be the angle of incident and angle of reflection respectively, then which one of the following condition is correct when light ray is reflected by a plane surface
1 point
i=r
i>r
i<r
none of these​

Answer 1

Explanation:

If the angle of incidence and angle of emergence of a light ray falling on a glass slab are given then by applying Snell’s law we can get,

sinr

sini

=

n

1

n

2

sine

sinr

=

n

2

n

1

On multiplying the above two equation we get

sine

sini

=1

sini=sine

Hence the angle of incidence is equal to the angle of emergence

Answer 2

i=r

Explanation:

always it will be equal