Physics Optics and Optical Instruments MCQ's

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A test from chapter 9 and 10 i.e Physics Optics and Optical Instruments of Physics part 1. This is Free online test for FSc and Entry test Preparation for UET, NUST, FAST, GIKI, PIEAS, NFC, Punjab University, UHS, other Engineering Universities and Medical Colleges.

1. A parallel beam of monochromatic light is incident normally on a narrow slit. A diffraction pattern is formed on a screen placed perpendicular to the direction of the incident beam. A the first minimum of the diffraction pattern, the phase difference between the rays coming from the two edges of the slit is

A) zero
B) π/2
C) 2 π
D) π

2. A plano-convex lens is made of glass of refractive index 1.5. The focal length f of the lens and radius of curvature R of its curved face are related as

A) f=R/2
B) f=R
C) f=2R
D) f=3/2R

3. In fiber optic the cause of power loss is/are

A) Absorption
B) Scattering
C) Dispersion
D) All

4. A telescope has an objective of focal length 100 cm and an eye. piece of focal length 5 cm. What is the magnifying power of the telescope when it is in normal adjustment?

A) 0.2
B) 2.0
C) 20
D) 200

5. Polarization can be achieved by

A) absorption
B) reflection
C) scattering
D) All

6. In case of single slit diffraction the condition for second minima is

A) dSinθ =λ
B) dsinθ=2λ
C) dsinθ=λ/2
D) 2dsinθ=0

7. __________ Phenomenon proves that nature of light is transverse

A) interference
B) diffraction
C) scattering
D) polarization

8. A light of λ=588 nm falls on half silvered glass plate in Michelson's interferometer. If movable mirror is moved through 0.23 mm, the number of fringes will be observed to shift

A) 822
B) 792
C) 686
D) none

9. A telescope has an objective of focal length 10cm. The magnifying power of telescope is 5. its length in normal adjustment is

A) 7.5 cm
B) 10.5 cm
C) 12 cm
D) 15 cm

10. Mode of propagation of light in multimode graded index fiber optic is

A) total internal reflection
B) continuous refraction
C) scattering
D) All