JEE Main 2025 (Online) 24th January Morning Shift | Geometrical Optics Question 32 | Physics

A plano-convex lens having radius of curvature of first surface 2 cm exhibits focal length of $f_1$ in air. Another plano-convex lens with first surface radius of curvature 3 cm has focal length of $f_2$ when it is immersed in a liquid of refractive index 1.2. If both the lenses are made of same glass of refractive index 1.5 , the ratio of $f_1$ and $f_2$ will be

$2: 3$

$1: 3$

$1: 2$

$3: 5$

JEE Main 2025 (Online) 23rd January Evening Shift

MCQ (Single Correct Answer)

-1

A concave mirror of focal length $f$ in air is dipped in a liquid of refractive index $\mu$. Its focal length in the liquid will be:

$\mu f$

$f$

$\frac{f}{\mu}$

$\frac{f}{(\mu-1)}$

JEE Main 2025 (Online) 23rd January Evening Shift

MCQ (Single Correct Answer)

-1

The refractive index of the material of a glass prism is $\sqrt{3}$. The angle of minimum deviation is equal to the angle of the prism. What is the angle of the prism?

$60^{\circ}$

$50^{\circ}$

$58^{\circ}$

$48^{\circ}$

JEE Main 2025 (Online) 23rd January Morning Shift

MCQ (Single Correct Answer)

-1

What is the lateral shift of a ray refracted through a parallel-sided glass slab of thickness ' $h$ ' in terms of the angle of incidence ' $i$ ' and angle of refraction ' $r$ ', if the glass slab is placed in air medium?

$\mathrm{h}$

$\frac{h \cos (i-r)}{\sin r}$

$\frac{\mathrm{h} \tan (\mathrm{i}-\mathrm{r})}{\tan \mathrm{r}}$

$\frac{h \sin (i-r)}{\cos r}$

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