TORCH BEARERS || HAY AND LIGHT

Kya Bihar Board Aasan Hai?

Hay fever in due to

Hay fever is due to

Three torches A, B and C shown in Fig. 11.7 are switched on one by one. The light from which of the torches will not form a shadow of the ball on the screen.

Hay fever is caused by

Gas Balloons Main Kaunsi Gas Hoti Hai?

Assertion : A laser beam 0.2 W power can drill holes through a metal sheet, whereas 1000 W torch-light cannot. Reason : The frequency of laser light is much higher than that of torch light.