NEET 2023 Manipur | Optics Question 4 | Physics

An object is mounted on a wall. Its image of equal size is to be obtained on a parallel wall with the help of a convex lens placed between these walls. The lens is kept at distance x in front of the second wall. The required focal length of the lens will be :

less than $$\frac{x}{4}$$

more than $$\frac{x}{4}$$ but less than $$\frac{x}{2}$$

$$\frac{x}{2}$$

$$\frac{x}{4}$$

NEET 2023

MCQ (Single Correct Answer)

-1

Light travels a distance $$\mathrm{x}$$ in time $$t_{1}$$ in air and $$10 \mathrm{x}$$ in time $$t_{2}$$ in another denser medium. What is the critical angle for this medium?

$$\sin ^{-1}\left(\frac{10 \mathrm{t}_{2}}{\mathrm{t}_{1}}\right)$$

$$\sin ^{-1}\left(\frac{t_{1}}{10 t_{2}}\right)$$

$$\sin ^{-1}\left(\frac{10 t_{1}}{t_{2}}\right)$$

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

NEET 2023

MCQ (Single Correct Answer)

-1

For Young's double slit experiment, two statements are given below :

Statement I : If screen is moved away from the plane of slits, angular separation of the fringes remains constant.

Statement II : If the monochromatic source is replaced by another monochromatic source of larger wavelength, the angular separation of fringes decreases.

In the light of the above statements, choose the correct answer from the options given below :

Both Statement I and Statement II are false

Statement I is true but Statement II is false

Statement I is false but Statement II is true

Both Statement I and Statement II are true

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