Q8 of 61 Page 61

Light is one of the slowest travelling energy with a speed of 3 × 10^–8 ms^-1

false ,speed of light is fasted it is 3 × 10⁸ ms^-1

The distance from centre of curvature of the mirror to the pole is called the focal length of the mirror.

When an object is at the centre of curvature of concave mirror the image formed will be virtual and erect.

The angle of incidence at which the angle of refraction is 0° is called the critical angle.

The reason for brilliance of diamonds is mainly due to total internal reflection of light.

Questions · 61

3. Light

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Light is one of the slowest travelling energy with a speed of 3 × 10–8 ms-1