" Qoefine power."

Define power of a refracting surface. (Define the power of a lens).

Distinguish between magnifying power and resolving power.

Assertion : In lower combination of electric bulbs the bulb of lower power emit more light than that of highest power bulb Reason : The power power bulb in series gets more of higest power bulb

Convex lens of power +5" D " and concave lens with power -3" D " are placed together, then the combined power is ………………..

Convex lens of power +5 D and concave lens with power -3D are placed together, then the combined power is____.

(a)Name the physical quantity measured in terms of horse power. (b)How is horse power related to the S.I unit of power?

1 MKS unit of power = ....... CGS unit of power.

Distinguish between Emissive power and absorptive power.

Define emissive power, coefficient of emission and absorptive power.

What is the sum of absorbing power reflecting power and transmitting power ?