JEE Main 2021 (Online) 18th March Morning Shift | Ray & Wave Optics Question 105 | Physics

JEE Main 2021 (Online) 18th March Morning Shift

MCQ (Single Correct Answer)

-1

In Young's double slit arrangement, slits are separated by a gap of 0.5 mm, and the screen is placed at a distance of 0.5 m from them. The distance between the first and the third bright fringe formed when the slits are illuminated by a mnochromatic light of 5890 $$\mathop A\limits^o $$ is :-

1178 $$\times$$ 10^$$-$$9 m

1178 $$\times$$ 10^$$-$$6 m

1178 $$\times$$ 10^$$-$$12 m

5890 $$\times$$ 10^$$-$$7 m

JEE Main 2021 (Online) 18th March Morning Shift

MCQ (Single Correct Answer)

-1

Your friend is having eye sight problem. She is not able to see clearly a distant uniform window mesh and it appears to her as non-uniform and distorted. The doctor diagnosed the problem as :

Astigmatism

Myopia with Astigmatism

Presbyopia with Astigmatism

Myopia and Hypermetropia

JEE Main 2021 (Online) 17th March Morning Shift

MCQ (Single Correct Answer)

-1

The thickness at the centre of a plane convex lens is 3 mm and the diameter is 6 cm. If the speed of light in the material of the lens is 2 $$\times$$ 10⁸ ms^$$-$$1. The focal length of the lens is ____________.

0.30 cm

30 cm

15 cm

1.5 cm

JEE Main 2021 (Online) 16th March Evening Shift

MCQ (Single Correct Answer)

-1

The refractive index of a converging lens is 1.4. What will be the focal length of this lens if it is placed in a medium of same refractive index? Assume the radii of curvature of the faces of lens are R₁ and R₂ respectively.

Zero

Infinite

$${{{R_1}{R_2}} \over {{R_1} - {R_2}}}$$

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