## JOBS OF TODAY

### MCQ ON RAY OPTICS : QUIZ ON RAY OPTICS PART-3

1/10
The endoscope used by physician to view internal part of a body organ is based on the principle of
a. Refraction
b. reflection
c. total internal reflection
d. dispersion
2/10
blue colour of sky is due to
a. natural
b. reflection
c. refraction
d. scattering off light by a large number of molecules in the atmosphere
Explanation: blue color of sky is due to scattering off light
3/10
Intensity of scattered light according to Rayleigh varies as
a. 1/╬╗⁸
b. 1/╬╗⁶
c. 1/╬╗⁴
d. 1/╬╗
4/10
In which cases a person cannot see image greater than himself
a. concave mirror
b. convex mirror
c. plane and concave mirror
d. none of these
5/10
Twinkling of stars is due to
a) Reflection of light
b) Refraction of light
c) diffraction of light
d) None of these
6/10
A thin prism of 20°  angle gives a deviation of 1°   . What is the value of refractive index of the material of the prism?
a) ╬╝ = 1.5
b) ╬╝ = 1.8
c) ╬╝ = 2.0
None of these
Explanation: us  the formula ╬┤ = A (╬╝-1))
7/10
What is the basic cause of refraction of light?
frequency of light changes as it moves from one medium to another medium.
velocity of light changes as it moves from one medium to another medium.
amplitude of light changes as it moves from one medium to another medium.
none of these
8/10
Refractive index of a medium can be less than one?
Yes
No
may or may not
all of these correct
Explanation: Refractive Index always >1.
9/10
Q5.When does Snell’s law of refraction fails?
failed when a light ray falls at 30° on the interface separating the two media.
failed when a light ray falls normally on the interface separating the two media.
failed when a light ray falls at 45° on the interface separating the two media.
None of these
10/10
which mirror is used as a make up mirror?
concave mirror
convex mirror
plane mirror
all of these
Result: