Refraction through Lenses and Optical Instruments — Physics STD 10 — Question

A wave passes from one medium to another medium. Mention the property of the wave which does not change.

Explain, why quartz prism is required for obtaining the spectrum of ultra-violet light?

State the position of heating element with respect to principal focus of concave reflector and give reason for choosing this position.

We can burn a piece of paper by focussing the sun rays by using a particular type of lens. Name the type of lens used for the above purpose. Draw a ray diagram to support your answer.

State the use of echo by a bat, dolphin and fisherman.

What is the latent heat of vaporization of steam?

Define the term power. State its S.I. unit.

What is the rating of fuse used in power circuits, in domestic use?

What will an alpha particle change into when it absorb two electrons.

Suggest one effective way for the safe disposal of nuclear waste.