COMEDK 2025 Afternoon Shift | Ray Optics Question 13 | Physics

A beam of light parallel to the principal axis of a concave and convex lens, first passes through the concave lens of focal length 0.5 m and then through the convex lens of focal length 1.75 m . If the lenses are placed 1.25 apart, which of the given statement is true?

The emergent beam will focus at 1.75 m on the principal axis.

The emergent beam will focus at 1.25 m on the principal axis.

The emergent beam will pass parallel to the principal axis.

The emergent beam will focus at 0.75 m on the principal axis.

COMEDK 2025 Afternoon Shift

MCQ (Single Correct Answer)

-0

When a body of refractive index $\boldsymbol{\mu}=\mathbf{1 . 4}$ is put into a liquid, the body becomes invisible. What would be the refractive index of the medium?

$\mu=1$

$\mu=0.7$

$\mu=2.4$

$\mu=1.4$

COMEDK 2025 Afternoon Shift

MCQ (Single Correct Answer)

-0

A ray of light is travelling from glass of refractive index $\frac{3}{2}$ to water of refractive Index $\frac{4}{3}$. What is the minimum angle of incidence for which no light enters in to the water?

$i_c=\sin ^{-1}\left(\frac{9}{8}\right)$

$i_c=\sin ^{-1}\left(\frac{8}{9}\right)$

$i_c=\sin ^{-1}\left(\frac{2}{3}\right)$

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

COMEDK 2025 Afternoon Shift

MCQ (Single Correct Answer)

-0

The focal lengths of the objective and eyepiece of a compound microscope are 1 cm and 10 cm respectively. Length of the tube is 25 cm . If the final image is formed at infinity , the magnifying power of the microscope is :

7.0

3.5

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