NEET 2020 Phase 1 | Optics Question 18 | Physics

NEET 2020 Phase 1

MCQ (Single Correct Answer)

-1

Assume that light of wavelength 600 nm is coming from a star. The limit of resolution of telescope whose objective has a diameter of 2 m is :

1.83 $$ \times $$ 10^-7 rad

7.32 $$ \times $$ 10^-7 rad

6.00 $$ \times $$ 10^-7 rad

3.66 $$ \times $$ 10^-7 rad

NEET 2020 Phase 1

MCQ (Single Correct Answer)

-1

A ray is incident at an angle of incidence i on one surface of a small angle prism (with angle of prism A) and emerges normally from the opposite surface. If the refractive index of the material of the prism is $$\mu $$, then the angle of incidence is nearly equal to :

$${{2A} \over \mu }$$

$$\mu $$A

$${{\mu A} \over 2}$$

$${A \over {2\mu }}$$

NEET 2020 Phase 1

MCQ (Single Correct Answer)

-1

In Young's double slit experiment, if the separation between coherent sources is halved and the distance of the screen from the coherent sources is doubled, then the fringe width becomes :

half

four times

one-fourth

double

NEET 2020 Phase 1

MCQ (Single Correct Answer)

-1

Light with an average flux of 20 W/cm² falls on a non-reflecting surface at normal incidence having surface area 20 cm². The energy received by the surface during time span of 1 minute is :

12 $$ \times $$ 10³ J

24 $$ \times $$ 10³ J

48 $$ \times $$ 10³ J

10 $$ \times $$ 10³ J

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