Question

# 8. For air to water incidence at an angle of incidence of 30 degrees for a...

8. For air to water incidence at an angle of incidence of 30 degrees for a ray of light of wavelength 450 nm. a) angle of reflection is 30 degrees and angle of refraction is 30 degrees b) angle of reflection is 20 degrees and angle of refraction is 20 degrees c) angle of reflection is 20 degrees and angle of refraction is 30 degrees d) none e) angle of reflection is 30 degrees and angle of refraction is 20 degrees

9.For air to glass incidence at an angle of incidence of 40 degrees for a ray of light of wavelength 550 nm. a) angle of reflection is 30 degrees, angle of refraction is 30 degree, and the refractive index is about 1.5 b) angle of reflection is 40 degrees, angle of refraction is 40 degree, and the refractive index is about 1.0 c) none d) angle of reflection is 40 degrees, angle of refraction is 25 degrees, and the refractive index is about 1.5 e) angle of reflection is 40 degrees, angle of refraction is 30 degree, and the refractive index is about 1.5

10. Which color is the most energetic if energy varies inversely as the wavelength? a) green b) none c) blue d) purple e) orange d) red

According Law of Reflection; Angle of Reflection = Angle of Incidence

From Snell' Law,

Here in Both Question's n1 is air, so , n1 = 1

Angle of Refraction,

8.

Angle of Reflection = 30

n = For water = 1.33

e) angle of reflection is 30 degrees and angle of refraction is 20 degrees

9.

Angle of Reflection = 40

n = For water = 1.5

d) angle of reflection is 40 degrees, angle of refraction is 25 degrees, and the refractive index is about 1.5

10.

From the question energy varies inversely as the wavelength. Wavelength order is given below.

Red > Orange > Green >Blue>Purple

Purple has the lowest wavelength, hence the highest energy

d) purple

#### Earn Coins

Coins can be redeemed for fabulous gifts.