If reflectance of a surface is 0.4 and absorptance is 0.2. What is the transmittance of the surface

Reflection from curved surface

The sum of the absorptance, reflectance and transmittance of a body is

Heat energy is incident on the surface at the rate of 1000J/min. If coefficient of absorption is and coeffiicient of reflection is 0.5 the heat energy transmitted by the surface in 5 min is

A radiation of energy E false normally on a perfectly reflecting surface. What is the momentum transferred to the surface is k£/c.what is the value of k ?

Assume that the acceleration due to gravity on the surface of the moon is 0.2 times the acceleration due to gravity on the surface of the earth. If R_e is the maximum range of a projectile on the earth's surface, what is the maximum range on the surface of the moon for the same velocity of projection

When a photosensitive surface is illuminated with light of wavelength lambda , the stopping potential is V_(0) . But when light of wavelength 2lambda is incident on the same surface, the stopping potential is (V_(0))/(4) . What is the threshold wavelength for the surface ?

An echo is heard when minimum distance of the reflecting surface is –

The angle of incidence on the surface of a diamond of refractive index 2.4, if the angle between the reflected and refracted rays is 90° is