Recent questions tagged marks2

0 votes

0 answers

(i) State the principle on which the working of an optical fibre is based. (ii) What are the necessary conditions for this phenomenon to

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

0 votes

0 answers

(i) What is the relation between critical angle and refractive index of a material? (ii) Does critical angle depend on the colour of light?

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

0 votes

0 answers

Draw a ray diagram of a reflecting type telescope. State two advantages of this telescope over a refracting

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

0 votes

0 answers

Draw a schematic diagram of refracting telescope. Write its two important

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

0 votes

0 answers

Draw a ray diagram for the formation of image by a compound microscope. Write the expression for total magnification when the image is formed at

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

0 votes

0 answers

A convex lens of focal length 25 cm is placed coaxially in contact with a concave lens of focal length 20 cm. Determine the power of the combination. Will the system be converging or diverging in

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

0 votes

0 answers

Draw a schematic arrangement of a reflecting telescope (Cassegrain) showing how rays coming from a distant object are received at the eyepiece. Write its two important advantages over a refracting

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

0 votes

0 answers

Two convex lenses of same focal length but of apertures `A_1 and A_2 (A_2 < A_1)`, are used as the objective lenses in two astronomical telescopes having identical eyepieces. What is the ratio of their resolving power? Which telescope will you prefer and why? Give

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

0 votes

0 answers

Define the resolving power of a telescope. Write any two advantages of a reflecting telescope over a refracting

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

0 votes

0 answers

A ray of light incident at an angle θ on a refracting face of a prism emerges from the other face normally. If the angle of the prism is 5° and the prism is made of a material of refractive index 1.5, the angle of incidence

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

0 votes

0 answers

A short pulse of white light is incident from air to a glass slab at normal incidence. After travelling through the slab, the first colour to emerge

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

0 votes

0 answers

An object approaches a convergent lens from the left of the lens with a uniform speed 5 m/s and stops at the focus. The

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

0 votes

0 answers

A passenger in an aeroplane

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

0 votes

0 answers

You are given four sources of light each one providing a light of a single colour – red, blue, green and yellow. Suppose the angle of refraction for a beam of yellow light corresponding to a particular angle of incidence at the interface of two media is 90°. Which of the following statements is correct if the source of yellow light is replaced with that of other lights without changing the angle of

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

0 votes

0 answers

The radius of curvature of the curved surface of a plano-convex lens is 20 cm. If the refractive index of the material of the lens be 1.5, it

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

0 votes

0 answers

The phenomena involved in the reflection of radiowaves by ionosphere is similar

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

0 votes

0 answers

The direction of ray of light incident on a concave mirror is shown by PQ while directions in which the ray would travel after reflection is shown by four rays marked 1, 2, 3 and 4 (Fig ). Which of the four rays correctly shows the direction of reflected

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

0 votes

0 answers

The optical density of turpentine is higher than that of water while its mass density is lower. Fig . shows a layer of turpentine floating over water in a container. For which one of the four rays incident on turpentine in Fig . the path shown is

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

0 votes

0 answers

A car is moving with at a constant speed of 60 km h–1 on a straight road. Looking at the rear view mirror, the driver finds that the car following him is at a distance of 100 m and is approaching with a speed of 5 km h –1. In order to keep track of the car in the rear, the driver begins to glance alternatively at the rear and side mirror of his car after every 2 s till the other car overtakes. If the two cars were maintaining their speeds, which of the following statement (s) is/are

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

0 votes

0 answers

There are certain material developed in laboratories which have a negative refractive index (Fig). A ray incident from air (medium 1) into such a medium (medium 2) shall follow a path given

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

Recent questions tagged marks2

Categories