Rules of Ray Diagram for Representation of Images Formed

Q.

Give the sign convention in concave and convex mirrors.

Q.

“The magnification produced by a spherical mirror is-3.”List four information you obtain from this statement about the mirror/object?

Q. Question 1
Which of the following can make a parallel beam of light when light from a point source is incident on it?

(a) Concave mirror as well as convex lens
(b) Convex mirror as well as concave lens
(c) Two plane mirrors placed at 90° to each other
(d) Concave mirror as well as concave lens

Q.

Question 10
Rays from sun converge at a point 15 cm in front of a concave mirror. Where should an object be placed so that size of its image is equal to the size of the object?

(a) 15 cm in front of the mirror
(b) 30 cm in front of the mirror
(c) between 15 cm and 30 cm in front of the mirror
(d) more than 30 cm in front of the mirror

Q.

What are spherical mirrors?

Q.

What is the difference between focus and principal focus.

Q. Question 3
Under which of the conditions a concave mirror can form a real image larger than the actual object?

(a) When the object is kept at a distance equal to its radius of curvature.
(b) When object is kept at a distance less than its focal length.
(c) When object is placed between the focus and centre of curvature.
(d) When object is kept at a distance greater than its radius of curvature.

Q.

What is the focal length of a concave lens?

Q.

Define the pole of the spherical mirror.

Q. Show that the mirror formula for spherical mirrors also holds for a plane mirror too.

Q. Linear magnification produced by spherical mirror is +3 state the type of mirror used and position of object with respect to pole of mirror.

Q.

A concave mirror is held in water. What would be the change in the focal length of the mirror?

Q.

A luminous point object is moving along the principal axis of a concave mirror with a focal length of $12cm$towards it. When its distance from the mirror is $20cm$ its velocity is $4cm/s.$The velocity of the image in $cm/s$ at that instant is:

1. $6,$towards the mirror

2. $6,$away from the mirror

3. $9,$away from the mirror

4. $9,$ towards the mirror

Q.

When a plain mirror is rotated 10° in clockwise direction and incident ray is rotated by 5° in the counterclockwise direction, by what angle will the reflected ray rotate ?

Q.

What do you understand by the term angle of minimum deviation? ln this position how is the angle of incidence related to the angle of emergence?

Q.

An erect, magnified and virtual image is formed, when an object is placed between the optical centre and principal focus of a lens. Name the lens.

1. Convex Lens

2. Concave lens

3. Convex and Concave lens

4. Plano-concave lens

Q.

Can a virtual image be formed on a screen?

Q. The magnification of a concave mirror is , when the object is placed between the Focus and the Pole of the mirror.

1. negative
2. positive
3. zero

Q.

If three concave mirrors are cut from a sphere and put in the given set up and if the sun lies on the principal axis of mirror 2 at infinity, then at what position will the images of the sun be formed by three mirrors?

1. at F₁, F₂ and F₃

2. at C

3. at P₁, P₂ and P₃

4. at F₂ only

Q.

A drop of water behaves like a ______ lens

Q. A ray of light passing through a principal focus, after refraction from a convex lens ___.

1. will emerge at an angle of ${45}^0$ to the principal axis
2. will emerge perpendicular to the principal axis
3. will emerge parallel to the principal axis
4. will emerge undeviated

Q.

(a) What type of lens is shown in the diagram on the right ? What will happen to the parallel rays of light ? Show by completing the ray diagram. (b) Your eye contains a convex lens. Why is it unwise to look at the sun ?

Q.

An incident ray which passes through the centre of curvature of a concave mirror is normal to the mirror surface, and after reflection......................

Q.

A ray of light coming parallel to the principal axis after passing through a convex lens, passes through its

1. optical centre

2. focus

3. centre of curvature

4. none of these

Q.

In case of refraction of light from a rectangular glass slab, if $i=$angle of incidence and $e=$angle of emergence, then

1. $e=i$

2. $e<i$

3. $e>i$

4. $i=e=0$

Q.

An object is placed at a distance 2f from the pole of a convex mirror of focal length f​​​​​​. Then, the magnification is ?

Q.

An instrument used by submarines to observe objects above the surface of the water is a __________.

Q. An object is 100mm in front of a concave mirror which produces an upright image. The radius of the curvature of the mirror is
​A)less than 100mm
B)between 100mm and 200mm
C)exact 200mm
D)more than 200mm

Q.

Which of the following ray diagrams is not correct?

1. 

2. 

3. 

4. 

Q.

When an equilateral prism is in minimum deviation position the angle of incidence is:

1. greater than the angle of emergence

2. smaller than the angle of emergence

3. equal to the angle of emergence

4. none of these