Hot questions

0 votes

0 answers

You are given prisms made of crown glass and flint glass with a wide variety of angles. Suggest a combination of prisms which will disperse (and displace) a pencil of white light without much

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

0 votes

0 answers

Explain: Magnifying power of a simple microscope is inversely proportional to the focal length of the lens. What then stops us from using a convex lens of smaller and smaller focal length and achieving greater and greater magnifying

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

0 votes

0 answers

A small telescope has an objective lens of focal length 140cm and an eyepiece of focal length 5.0cm. What is the magnifying power of the telescope for viewing distant objects when the telescope is in normal adjustment (i.e., when the final image is at infinity)?(ii) the final image is

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

0 votes

0 answers

Under what condition, does a biconvex lens of glass having a certain refractive index act as a plane glass sheet when immersed in a

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

0 votes

0 answers

When monochromatic light travels from one medium to another, its wavelength changes but frequency remains the same.

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

0 votes

0 answers

Define power of a lens. Write its units. Deduce the relation `1/f=1/f_1+1/f_2` for two thin lenses kept in contact

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

0 votes

0 answers

A ray of light is incident on one face of a glass prism and emerges out from the other face. Trace the path of the ray and derive an expression for refractive index of the glass

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

0 votes

0 answers

(i) How is the focal length of a spherical mirror affected when the wavelength of the light used is increased? (ii) A convex lens has 20 cm focal length in air. What is its focal length in water? (Refractive index of air-water = 1.33, refractive index of air-glass =

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

0 votes

0 answers

An object of 2 cm height is placed at a distance of 30 cm from a convex mirror of focal length 15 cm. Find the nature, position and size of the image

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

0 votes

0 answers

The velocity of a certain monochromatic light in a given transparent medium is `2.225 xx10^8` m/s. What is the (i) critical angle of incidence (ii) polarising angle for this

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 compound microscope uses an objective lens of focal length 4 cm and eyepiece lens of focal length 10 cm. An object is placed at 6 cm from the objective lens. Calculate the magnifying power of the compound microscope. Also, calculate the length of the

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

0 votes

0 answers

(i) Draw a neat labelled ray diagram of a compound microscope. Explain briefly its working. (ii) Why must both the objective and the eyepiece of a compound microscope have short focal

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

0 votes

0 answers

How is the working of a telescope different from that of a microscope? The focal lengths of the objective and eyepiece of a microscope are 1.25 cm and 5 cm, respectively. Find the position of the object relative to the objective in order to obtain an angular magnification of 30 in normal

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

0 votes

0 answers

Draw a ray diagram to show the working of a compound microscope. Deduce an expression for the total magnification when the final image is formed at the near point. In a compound microscope, an object is placed at a distance of 1.5 cm from the objective of focal length 1.25 cm. If the eyepiece has a focal length of 5 cm and the final image is formed at the near point. Estimate the magnifying power of the

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

0 votes

0 answers

Draw the labelled ray diagram for the formation of image by an astronomical telescope. Derive the expression for its magnifying power in normal adjustment. Write two basic features which can distinguish between a telescope and a Compound

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

0 votes

0 answers

What is the shape of the wavefront in each of the following cases: The portion of the wavefront of light from a distant star intercepted by the

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

0 votes

0 answers

In double-slit experiment using light of wavelength 600 nm, the angular width of a fringe formed on a distant screen is 0.1°. What is the spacing between the two

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

0 votes

0 answers

Answer the following questions: When a tiny circular obstacle is placed in the path of light from a distant source, a bright spot is seen at the centre of the shadow of the obstacle. Explain

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

0 votes

0 answers

A parallel beam of light of wavelength 500 nm falls on a narrow slit and the resulting diffraction pattern is observed on a screen 1 m away. It is observed that the first minimum is at a distance of 2.5 mm from the centre of the screen. Find the width of the

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

Hot questions

Categories