JEE Main 2018 (Online) 15th April Morning Slot | Ray & Wave Optics Question 204 | Physics

JEE Main 2018 (Online) 15th April Morning Slot

MCQ (Single Correct Answer)

-1

Light of wavelength $$550$$ $$nm$$ falls normally on a slit of width $$22.0 \times {10^{ - 5}}$$ $$cm.$$ The angular position of the second minima from the central maximum will (in radians) :

$${\pi \over {12}}$$

$${\pi \over 8}$$

$${\pi \over 6}$$

$${\pi \over 4}$$

JEE Main 2018 (Online) 15th April Morning Slot

MCQ (Single Correct Answer)

-1

A planoconvex lens becomes an optical system of $$28$$ $$cm$$ focal length when its plane surface is silvered and illuminated from left to right as shown in Fig-A.

If the same lens is instead silvered on the curved surface and illuminated from other side as in Fig-B, it acts like an optical system of focal length $$10$$ $$cm.$$ The refractive index of the material of lens is :

JEE Main 2018 (Online) 15th April Morning Slot Physics - Ray & Wave Optics Question 215 English

JEE Main 2018 (Online) 15th April Morning Slot Physics - Ray & Wave Optics Question 215 English

$$1.50$$

$$1.55$$

$$1.75$$

$$1.51$$

JEE Main 2018 (Online) 15th April Morning Slot

MCQ (Single Correct Answer)

-1

A particle is oscillating on the $$X$$-axis with an amplitude $$2$$ $$cm$$ about the point $${x_0} = 10\,cm,$$ with a frequency $$\omega $$. A concave mirror of local length $$5$ $$cm$$ is placed at the origin (see figure).

JEE Main 2018 (Online) 15th April Morning Slot Physics - Ray & Wave Optics Question 213 English

JEE Main 2018 (Online) 15th April Morning Slot Physics - Ray & Wave Optics Question 213 English

Identify the correct statements.

The image executs periodic motoin.

The image executes non-periodic motion.

The turning points of the image are asymmetric w.r.t. the image of the point at $$x=10$$ $$cm$$.

The distance between the turning points of the oscillation of the image is $${{100} \over {21}}\,cm.$$

JEE Main 2017 (Online) 9th April Morning Slot

MCQ (Single Correct Answer)

-1

In an experiment a convex lens of focal length 15 cm is placed coaxially on an optical bench in front of a convex mirror at a distance of 5 cm from it. It is found that an object and its image coincide, if the object is placed at a distance of 20 cm from the lens. The focal length of the convex mirror is :

27.5 cm

20.0 cm

25.0 cm

30.5 cm

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