QUESTIONS: (1 mark each)
. Define the principal focus of a concave mirror.
. Which mirror is used by dentists?
. What are the advantages and disadvantages of using convex mirror for seeing traffic at the rear?
. What are the advantages and disadvantages of using a convex mirror for seeing traffic at the rear?
. The refractive index of diamond is 2.42. What is the meaning of this statement?
. A ray is incident along ACB on a spherical mirror, where C is the centre of curvature.
. Find the focal length of a convex mirror whose radius of curvature is 32 cm.
. Why do we prefer a convex mirror as a rear- view mirror in vehicles?
. What happens when the rays of sun are focused at a point on the paper by using concave mirror?
. How is the refractive index of an optical medium related to the speed of light in that medium?
. Define the term absolute refractive index of a medium.
QUESTIONS: (2mraks each)
. Name the type of mirror used in the following situations:
Headlights of a car.
Side/rear view mirror of a vehicle.
Support your answer with reason.
. Show that the mirror formula for spherical mirrors also holds for a plane mirror too.
. A concave mirror produces three times magnified real image of an object placed at 10 cm in front of it. Where is the image located?
. Light 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 108 m s-1.
Q5. Name the type of mirror which is known as shaving mirror. Give relevant ray diagram to justify your answer.
. Find the focal length in cm of a lens of power -2D. Identify the type of this lens in this case.
. Find the refractive index of glass with respect to water where refractive index of glass with respect to air is nga = 3/2 and that of water with respect to air is nwa = 4/3.
. A converging lens has a focal length of 250 mm. Calculate its power and express it according to sign convention.
. List four specific characteristics of the images of the object formed by convex mirrors.
. State two positions in which a concave mirror produces a magnified image of a given object. List two differences between the two images.
. State the meaning of linear magnification. How is it related to object distance and image distance? When is magnification positive or negative?
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