NEET 2017 | Wave Optics Question 18 | Physics

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

NEET 2016 Phase 1

MCQ (Single Correct Answer)

-1

In a diffraction pattern due to a single slit of width $$a$$, the first minimum is observed at an angle 30^o when light of wavelength 5000 $$\mathop A\limits^ \circ $$ is incident on the slit. The first secondary maximum is observed at an angle of

sin^$$-$$1$$\left( {{1 \over 2}} \right)$$

$${\sin ^{ - 1}}\left( {{3 \over 4}} \right)$$

$${\sin ^{ - 1}}\left( {{1 \over 4}} \right)$$

$${\sin ^{ - 1}}\left( {{2 \over 3}} \right)$$

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