NEET 2017 | Wave Optics Question 17 | Physics

NEET 2017

MCQ (Single Correct Answer)

-1

Young's double slit experiment is first performed in air and then in a medium other than air. It is found that 8^th bright fringe in the medium lies where 5^th dark fringe lies in air. The refractive index of the medium is nearly

1.59

1.69

1.78

1.25

NEET 2017

MCQ (Single Correct Answer)

-1

Two polaroids P₁ and P₂ are placed with their axis perpendicular to each other. Unpolarised light $$I$$₀ is incident on P₁. A third polaroid P₃ is kept in between P₁ and P₂ such that its axis makes an angle 45^o with that of P₁. The intensity of transmitted light through P₂ is

$${{{I_0}} \over 4}$$

$${{{I_0}} \over 8}$$

$${{{I_0}} \over 16}$$

$${{{I_0}} \over 2}$$

NEET 2016 Phase 2

MCQ (Single Correct Answer)

-1

The interference pattern is obtained with two coherent light sources of intensity ratio n. In the interference pattern, the ratio $${{{I_{max}} - {I_{\min }}} \over {{I_{max}} + {I_{min}}}}$$ will be

$${{\sqrt n } \over {n + 1}}$$

$${{2\sqrt n } \over {n + 1}}$$

$${{\sqrt n } \over {{{\left( {n + 1} \right)}^2}}}$$

$${{2\sqrt n } \over {{{\left( {n + 1} \right)}^2}}}$$

NEET 2016 Phase 2

MCQ (Single Correct Answer)

-1

A linear aperture whose width is 0.02 cm is placed immediately in front of a lens of focal length 60 cm. The aparture is illuminated normally by a parallel beam of wavelength 5 $$ \times $$ 10^$$-$$5 cm. The distance of the first dark band of the diffraction pattern from the centre of the screen is

0.10 cm

0.25 cm

0.20 cm

0.15 cm

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