31 solutions available
Question 1Which one of the following materials cannot be used to make a lens?WaterGlassPlasticClay
Question 2The image formed by a concave mirror is observed to be virtual, erect and larger than the object. Where should be the position of the...
Question 3Where should an object be placed in front of a convex lens to get a real image of the size of the object?At the principal focus of the...
Question 4A spherical mirror and a thin spherical lens have a focal length of -15 cm. The mirror and the lens are likely to beboth concaveboth...
Question 5No matter how far you stand from a mirror, your image appears erect. The mirror is likely to beonly planeonly concaveonly convexeither...
Question 6Which of the following lenses would you prefer to use while reading small letters found in a dictionary?A convex lens of focal length 50...
Question 7We wish to obtain an erect image of an object, using a concave mirror of focal length 15 cm. What should be the range of distance of the...
Question 8Name the type of mirror used in the following situations.(a) Headlights of a car(b) Side/rear-view mirror of a vehicle(c) Solar...
Question 9One-half of a convex lens is covered with black paper. Will this lens produce a complete image of the object? Verify your answer...
Question 10An object 5 cm in length is held 25 cm away from a converging lens of focal length 10 cm. Draw the ray diagram and find the position, size...
Question 11A concave lens of focal length 15 cm forms an image 10 cm from the lens. How far is the object placed from the lens? Draw the ray diagram.
Question 12An object is placed at a distance of 10 cm from a convex mirror of focal length 15 cm. Find the position and nature of the image.
Question 13The magnification produced by a plane mirror is +1. What does this mean?
Question 14An object 5.0 cm in length is placed at a distance of 20 cm in front of a convex mirror of radius of curvature 30 cm. Find the position of...
Question 15An object of size 7.0 cm is placed at 27 cm in front of a concave mirror of focal length 18 cm. At what distance from the mirror should a...
Question 16Find the focal length of a lens of power -2.0 D. What type of lens is this?
Question 17A doctor has prescribed a corrective lens of power +1.5 D. Find the focal length of the lens. Is the prescribed lens diverging or...
Question 1Define the principal focus of a concave mirror.
Question 2The radius of curvature of a spherical mirror is 20 cm. What is its focal length?
Question 3Name the mirror that can give an erect and enlarged image of an object.
Question 4Why do we prefer a convex mirror as a rear-view mirror in vehicles?
Question 1Find the focal length of a convex mirror whose radius of curvature is 32 cm.
Question 2A concave mirror produces three times magnified (enlarged) real image of an object placed at 10 cm in front of it. Where is the image...
Question 1A ray of light travelling in air enters obliquely into water. Does the light ray bend towards the normal or away from the normal? Why?
Question 2Light enters from air to glass, having refractive index 1.50. What is the speed of light in the glass? The speed of light in vacuum is 3 x...
Question 3Find out, from Table 9.3, the medium having the highest optical density. Also, find the medium with the lowest optical...
Question 4You are given kerosene, turpentine and water. In which of these does the light travel fastest? Use the information given in Table...
Question 5The refractive index of diamond is 2.42. What is the meaning of this statement?
Question 1Define 1 dioptre of power of a lens.
Question 2A convex lens forms a real and inverted image of a needle at a distance of 50 cm from it. Where is the needle placed in front of the convex...
Question 3Find the power of a concave lens of focal length 2 m.