JEE Main 2017 (Offline) | Ray & Wave Optics Question 211 | Physics

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

JEE Main 2017 (Offline)

MCQ (Single Correct Answer)

-1

A diverging lens with magnitude of focal length 25 cm is placed at a distance of 15cm from a converging lens of magnitude of focal length 20cm. A beam of parallel light falls on the diverging lens. The final image formed is:

real and at a distance of 6 cm from the convergent lens.

real and at a distance of 40 cm from convergent lens.

virtual and at a distance of 40 cm from convergent lens.

real and at a distance of 40 cm from the divergent lens.

JEE Main 2016 (Online) 10th April Morning Slot

MCQ (Single Correct Answer)

-1

Two stars are 10 light years away from the earth. They are seen through a telescope of objective diameter 30 cm. The wavelength of light is 600 nm. To see the stars just resolved by the telescope, the minimum distance between them should be (1 light year = 9.46 $$ \times $$ 10¹⁵ m) of the order of :

10⁶ km

10⁸ km

10¹¹ km

10¹⁰ km

PREVIOUS NEXT