JEE Main 2023 (Online) 31st January Evening Shift | Geometrical Optics Question 84 | Physics

A microscope is focused on an object at the bottom of a bucket. If liquid with refractive index $\frac{5}{3}$ is poured inside the bucket, then the microscope has to be raised by $30 \mathrm{~cm}$ to focus the object again. The height of the liquid in the bucket is :

$50 \mathrm{~cm}$

$18 \mathrm{~cm}$

$75 \mathrm{~cm}$

$12 \mathrm{~cm}$

JEE Main 2023 (Online) 30th January Evening Shift

MCQ (Single Correct Answer)

-1

A thin prism $P_1$ with an angle $6^{\circ}$ and made of glass of refractive index $1.54$ is combined with another prism $P_2$ made from glass of refractive index $1.72$ to produce dispersion without average deviation. The angle of prism $P_2$ is

$4.5^{\circ}$

$7.8^{\circ}$

$1.3^{\circ}$

$6^{\circ}$

JEE Main 2023 (Online) 30th January Morning Shift

MCQ (Single Correct Answer)

-1

A person has been using spectacles of power $$-1.0$$ dioptre for distant vision and a separate reading glass of power $$2.0$$ dioptres. What is the least distance of distinct vision for this person :

50 cm

40 cm

30 cm

10 cm

JEE Main 2023 (Online) 29th January Evening Shift

MCQ (Single Correct Answer)

-1

A scientist is observing a bacteria through a compound microscope. For better analysis and to improve its resolving power he should. (Select the best option)

Decrease the focal length of the eye piece.

Increase the wave length of the light

Increase the refractive index of the medium between the object and objective lens

Decrease the diameter of the objective lens

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