Reflection telescopes use ________ to focus light.

Diagram shows a glass block is placed in front of a pen. The pen appears bent is due to...

Diagram shows a light ray directed normally to PQ of a glass prism. Given that the refractive index of the prism is 1.50

Which path A, B, C and D shows the correct propagation of light after passing PR?

The speed of light in vacuum is 3 x 10⁸ m s^-1. When the light penetrates a glass window, its speed becomes 1.86 x 10⁸ m s^-1.

What is the refractive index of the glass window?

Diagram shows a light ray, K, directed into a glass block. The critical angle of the glass is 42^o. In which direction does the light move from point O?

Diagram 17 shows a light ray, P is directed to the centre, O of semicircular glass block. Refractive index of the glass is 1.52.

At which direction A, B, C or D does the light propagate after point O?

Total internal reflection occurs when incident angle is ___________ critical angle.

There are few example of application and innovation which is ____________

State the phenomena of total internal reflection.

i. Formation of rainbow

ii. mirage

ii. prism periscope

iv. optic fibre

A ray of light in a glass block is incident on a boundary with air at an angle of incidence of 40^o. The critical angle at this boundary is 43^o. What happens to the ray of light at the boundary?

What is number 1?

Which lens represents the path light takes through a diverging lens?

A lens that is thinner in the middle than on the outside is called __________.