Physics - Light Class 7 questions

Q1: Multiple Choice Questions

     

a  If angle of incidence is 300 then angle of reflection will be

(a) 60⁰
(b) 0⁰
(c) 30⁰
(d) 90⁰

b.  The image formed by plane mirror is

(a) Erect
(b) Upside
(c) Real
(d) At infinity

c.   Splitting of white light into seven colours is known as

(a) Dispersion
(b) Reflection
(c) Refraction
(d) Total internal reflection

d.   The image formed in a plane mirror is sideways reversed. This phenomenon is called:

(a) Lateral inversion.
(b) Dispersion.
(c) Splitting.
(d) Refraction

e.    The ray of light strikes at the surface of mirror is called

(a) Reflected ray
(b) Incident ray
(c) Normal ray
(d) Transmitted ray

f.   Sunlight consists of
(A) black colour only.
(B) five colours.
(C) seven colours.
(D) blue colour.

Q2: Differentiate between real & virtual image?

Q3: Why concave mirror is called a converging mirror and a convex mirror is called a diverging mirror?

Q4: Explain the nature of image formed in a concave mirror.

Q5: What are the uses of concave mirror?

Q6: What is a lens?

Q7: How is the rainbow formed?

Q8: Apart from rainbow where else we can see seven colours of sunlight?

Q9: State the characteristics of the image formed by a plane mirror.

Q10: What is a virtual image? Give one situation where a virtual image is formed.

Q11: Differentiate between a convex and a concave lens.

Q12: What is rainbow?

Q13: A rotating disc has a pencil that serves as a rotator. The disc is covered with violet, indigo, blue, green, yellow, orange and red coloured papers. When the disc is rotated, it appears white instead of the individual colours. Why?

Q14: Take a glass prism. Allow a narrow beam of sunlight to pass through a small hole in the window of a dark room to fall on one face of the prism, what will happen to the light?

Q15: Allow the light coming out of the other face of the prism to fall on a white sheet of paper or a white wall. Explain your observation.

Q16: What is the relation between reflection of light and the image of an object?

Q17: Images in a mirror are located at the same distance behind the mirror as the object in front of it. Explain the importance of this property of mirror.

Q18: What do you mean by left right inversed?

Q19: How you can create a mirror image?

Q20: Explain a spherical mirror.

Q21: Explain a concave mirror. What is the nature of image formed by this mirror?

Q22: Explain a convex mirror. What is the nature of image formed by this mirror?

Q23: Define the following:

Real image

Virtual image

Q24: Define the following:

Opaque Spherical Surface

Transparent Spherical Surface

Q25: Explain concave lens and there application.

Q26: Explain convex lens and there application.

Q27. What are the laws of reflection?