Rules for Ray Diagram

Q.

The ray diagram showing the correct path of the ray after passing through the lens is:

1. II and III only
2. I and II only
3. I, II and III
4. I, II and IV

Q. A light ray incident obliquely to the principal axis towards the pole of a mirror is reflected at an angle equal to the angle of incidence.

1. True
2. False

Q. Minimum number of rays required to form an image of an object using a convex lens are ___.

1. 5
2. 3
3. 4
4. 2

Q. How are focal length and radius of curvature connected? Prove the relation between focal length f and radius of curvature R.

Q. A mirror forms an image which is 30 cm from an object and twice its height.
(a) Where must the mirror be situated?
(b) What is the radius of curvature?
(c) Is the mirror convex or concave?

Q. When the object is placed beyond the centre of curvature of a concave mirror, the size of the image formed is the size of the object.

1. equal to
2. more than
3. less than

Q. In which of the following cases a light ray suffers the maximum deviation while passing through pole?

1. 
2. 
3. 
4. 

Q. The part of the lens through which a ray passes without suffering any deviation is called as ___ .

1. paraxial ray
2. optical centre
3. focus
4. centre of curvature

Q. Lenses have two radii of curvature, as they have two refracting curved surfaces.

1. True
2. False

Q. The distance between optical centre and is known as focal length of the lens.

1. principal focus
2. centre of curvature
3. aperture

Q. The distance between the image formed by the concave mirror and the pole is ______.

1. 45 cm
2. 90 cm
3. 35 cm
4. 70 cm