JEE Main 2017 (Online) 8th April Morning Slot | Ray & Wave Optics Question 209 | Physics

JEE Main 2017 (Online) 8th April Morning Slot

MCQ (Single Correct Answer)

-1

Let the refractive index of a denser medium with respect to a rarer medium be n₁₂ and its critical angle be θ_C . At an angle of incidence A when light is travelling from denser medium to rarer medium, a part of the light is reflected and the rest is refracted and the angle between reflected and refracted rays is 90^o. Angle A is given by :

$${1 \over {{{\cos }^{ - 1}}\left( {\sin {\theta _C}} \right)}}$$

$${1 \over {{{\tan }^{ - 1}}\left( {\sin {\theta _C}} \right)}}$$

$${\cos ^{ - 1}}\,\left( {\sin {\theta _C}} \right)$$

$${\tan ^{ - 1}}\,\left( {\sin {\theta _C}} \right)$$

JEE Main 2017 (Online) 8th April Morning Slot

MCQ (Single Correct Answer)

-1

A single slit of width b is illuminated by a coherent monochromatic light of wavelength $$\lambda $$. If the second and fourthminima in the diffraction pattern at a distance 1 m from the slit are at 3 cm and 6 cm respectively from the central maximum, what is the width of the central maximum ? (i.e. distance between first minimum on either side of the central maximum)

1.5 cm

3.0 cm

4.5 cm

6.0 cm

JEE Main 2017 (Offline)

MCQ (Single Correct Answer)

-1

In a Young’s double slit experiment, slits are separated by 0.5 mm, and the screen is placed 150 cm away. A beam of light consisting of two wavelengths, 650 nm and 520 nm, is used to obtain interference fringes on the screen. The least distance from the common central maximum to the point where the bright fringes due to both the wavelengths coincide is

15.6 mm

1.56 mm

7.8 mm

9.75 mm

JEE Main 2017 (Offline)

MCQ (Single Correct Answer)

-1

An observer is moving with half the speed of light towards a stationary microwave source emitting waves at frequency 10 GHz. What is the frequency of the microwave measured by the observer? (speed of light = 3 ×10⁸ ms^–1)

15.3 GHz

10.1 GHz

12.1 GHz

17.3 GHz

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