Recent questions in Physics

0 votes

0 answers

A magician during a show makes a glass lens with n = 1.47 disappear in a trough of liquid. What is the refractive index of the liquid? Could the liquid be

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

0 votes

0 answers

If f = 0.5 m for a glass lens, what is the power of the

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

0 votes

0 answers

The radii of curvature of the faces of a double convex lens are 10 cm and 15 cm. Its focal length is 12 cm. What is the refractive index of

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

0 votes

0 answers

A convex lens has 20 cm focal length in air. What is focal length in water? (Refractive index of air-water = 1.33, refractive index for air-glass =

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

0 votes

0 answers

Find the position of the image formed by the lens combination given in the Fig.

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

0 votes

0 answers

What focal length should the reading spectacles have for a person for whom the least distance of distinct vision is 50

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

0 votes

0 answers

The far point of a myopic person is 80 cm in front of the eye. What is the power of the lens required to enable him to see very distant objects

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

0 votes

0 answers

In what way does the corrective lens help the above person? Does the lens magnify very distant objects? Explain

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

0 votes

0 answers

The above person prefers to remove his spectacles while reading a book. Explain

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

0 votes

0 answers

The near point of a hypermetropic person is 75 cm from the eye. What is the power of the lens required to enable the person to read clearly a book held at 25 cm from the

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

0 votes

0 answers

In what way does the corrective lens help the above person? Does the lens magnify objects held near the

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

0 votes

0 answers

The above person prefers to remove the spectacles while looking at the sky. Explain

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

0 votes

0 answers

A small candle, 2.5 cm in size is placed at 27 cm in front of a concave mirror of radius of curvature 36 cm. At what distance from the mirror should a screen be placed in order to obtain a sharp image? Describe the nature and size of the image. If the candle is moved closer to the mirror, how would the screen have to be

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

0 votes

0 answers

A 4.5 cm needle is placed 12 cm away from a convex mirror of focal length 15 cm. Give the location of the image and the magnification. Describe what happens as the needle is moved farther from the

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

0 votes

0 answers

A tank is filled with water to a height of 12.5 cm. The apparent depth of a needle lying at the bottom of the tank is measured by a microscope to be 9.4 cm. What is the refractive index of water? If water is replaced by a liquid of refractive index 1.63 up to the same height, by what distance would the microscope have to be moved to focus on the needle

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

0 votes

0 answers

Fig (a) and (b) show refraction of a ray in air incident at 60° with the normal to a glass-air and water-air interface, respectively. Predict the angle of refraction in glass when the angle of incidence in water is 45º with the normal to a water-glass interface [Fig.

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

0 votes

0 answers

A small bulb is placed at the bottom of a tank containing water to a depth of 80cm. What is the area of the surface of water through which light from the bulb can emerge out? Refractive index of water is 1.33. (Consider the bulb to be a point

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

0 votes

0 answers

A prism is made of glass of unknown refractive index. A parallel beam of light is incident on a face of the prism. The angle of minimum deviation is measured to be 40°. What is the refractive index of the material of the prism? The refracting angle of the prism is 60°. If the prism is placed in water (refractive index 1.33), predict the new angle of minimum deviation of a parallel beam of

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

0 votes

0 answers

Double-convex lenses are to be manufactured from a glass of refractive index 1.55, with both faces of the same radius of curvature. What is the radius of curvature required if the focal length is to be

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

0 votes

0 answers

A beam of light converges at a point P. Now a lens is placed in the path of the convergent beam 12cm from P. At what point does the beam converge if the lens is a convex lens of focal length

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

Recent questions in Physics

Categories