MHT CET 2026 17th April Morning Shift | Ray Optics Question 8 | Physics

A lens of refractive index '$\mu$' has focal length '$f$'. When the lens is immersed in a liquid of refractive index '$\mu_0$', its focal length becomes '$f_0$'. Then '$f_0$' is given by

$\dfrac{(\mu_0-\mu)f}{\mu(\mu_0-1)}$

$\dfrac{\mu(\mu_0-1)f}{(\mu_0-\mu)}$

$\dfrac{(\mu-\mu_0)f}{\mu_0(\mu-1)}$

$\dfrac{\mu_0(\mu-1)f}{(\mu-\mu_0)}$

MHT CET 2026 16th April Evening Shift

MCQ (Single Correct Answer)

-0

A ray of light passes from the vacuum into a medium of refractive index 'n'. If the angle of incidence is twice the angle of refraction, then the angle of incidence in terms of refractive index is

$\sin^{-1}\left(\dfrac{n}{2}\right)$

$2\cos^{-1}\left(\dfrac{n}{2}\right)$

$2\sin^{-1}\left(\dfrac{n}{2}\right)$

$\cos^{-1}\left(\dfrac{n}{2}\right)$

MHT CET 2026 16th April Evening Shift

MCQ (Single Correct Answer)

-0

A convex lens having refractive index 1.6 has focal length 12 cm, when it is in air. The focal length of that lens when placed in water is (refractive index of water = 1.28)

$655\ \text{mm}$

$288\ \text{mm}$

$555\ \text{mm}$

$355\ \text{mm}$

MHT CET 2026 16th April Morning Shift

MCQ (Single Correct Answer)

-0

A simple microscope is used to see the object first in blue light and then in red light. Due to the change from blue to red light, what is the effect on its magnifying power?

decreases

increases

remains constant

first increase and then decreases

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