Light

CLASS-X

LIGHT

ASSIGNMENT-1

Q1. A parallel beam of light is made to fall on a concave mirror. An image is formed at a distance of 7.5cm from the mirror. What is the focal length and radius of curvature of the mirror?

Q2. A real image, 1/5^th the size of the object is formed at a distance of 18cm from a mirror. What is the nature of the mirror? Calculate its focal length also.

Q3. An object is placed at a distance of 5m from a convex mirror of radius of curvature 20cm. Where is the image formed and what is its nature?

Q4. We wish to obtain an erect image of an object, using a concave mirror of focal length 15cm.

a)     What should be the range of distance of the object from the mirror?

b)    What is the nature of the image?

c)     Is the image larger or smaller than the object?

Q5. The magnification produced by a plane mirror is +1. What does this mean?

Q6. An object 2cm high is placed at a distance of 16cm from a concave mirror which produces a real image 3cm high.

a)     Find the position of the image.

b)    What is the focal length of the mirror?

Q7. An object is placed at a distance of 15cm from a convex mirror of focal length 30cm. Find the position and nature of the image.

Q8. A convex mirror has a focal length of 20cm. Find the position of the object for which the image will be half the size of the object.

Q9. A concave mirror of focal length ‘f’ produces an image ‘n’ times the size of the object. What would be the object distance for which the image is real?

Q10. Why do we prefer a convex mirror as a rear-view mirror in vehicles?