Q 1 – We are able to see an object due to the presence of
(a) light
(b) dark
(c) refraction
(d) object
Q 2 – Maximum part of light is reflected by
(a) opaque object
(b) translucent object
(c) transparent object
(d) all of these
Q 3 – The perpendicular drawn to the reflecting surface is called
(a) normal
(b) incident ray
(c) reflected ray
(d) none of these
Q 4 – The angle of incidence is always _______ to the angle of reflection.
(a) greater
(b) smaller
(c) equal
(d) none of these
Q 5 – The reflection of light from a smooth surface is called
(a) diffused reflection
(b) regular reflection
(c) dispersion
(d) spectrum
Q 6 – The nature of image formed by plane mirror is
(a) real and inverted
(b) virtual and erect
(c) real and erect
(d) virtual and inverted
Q 7 – If two plane mirrors are inclined at an angle of 40°, number of images formed will be
(a) 7
(b) 8
(c) 9
(d) 5
Q 8 – Type of mirror used as side view mirror is
(a) convex mirror
(b) plane mirror
(c) concave mirror
(d) ground mirror
Q 9 – Band of seven colours is called
(a) VIBGYOR
(b) dispersion
(c) spectrum
(d) reflection
Q 10 – Two mirrors A and B are placed at right angles to each other. A ray of light incident on mirror A at an angle of 25° falls on mirror B after reflection. The angle of reflection for the ray reflected from mirror B would be
(a) 25°
(b) 50°
(c) 65°
(d) 115°
Q 11 – Fill in the blanks
1. Light is a form of ___________.
2. The ray of light which strikes the reflecting surface is called ___________.
3. The bouncing back of light after it falls on a surface is called
___________.
4. A mirror has ___________ and ___________ surface.
5. ___________ is the perpendicular line on the incidence point.
Q 12 – True or false
1. Deficiency of vitamin B causes night blindness.
2. In the Braille system, patterns are made with coloured dots.
3. Normal make 60° angle with the reflecting surface.
4. Angle of incidence is always equal to angle of reflection.
5. Diffused reflection occurs due to rough surface.
6. Kaleidoscope is based on the principle of dispersion of light.
Q 13 – Match the following
Column A | Column B |
1. Pupil | (a) Visually challenged |
2. Rainbow | (b) 25 cm to infinity |
3. Cones | (c) Controlled by iris |
4. Normal vision | (d) Dispersion of light |
5. Rubbing | (e) Sensitive to bright light |
Q 14 – What is yellow spot?
Q 15 – What do we call the image that cannot be obtained on a screen?
Q 16 – How do we see various objects?
Q 17 – List the characteristics of an image formed in a plane mirror.
Q 18 – What is the far point and near point of the human eye with normal vision?
Q 19 – Write a short note on Braille system.
Q 20 – Write a note on ‘The Human Eye’.
Q 21 – Explain some common eye defects in human.
Q 22 – Boojho planned an activity to observe an object A through pipes as shown in the given figure, so that he could see objects which he could not directly see.
(a) How many mirrors should he use to see the object?
(b) Indicate the positions of the mirrors in the figure.
(c) What must be the angle with respect to the incident light at which he should place the mirrors?
(d) Indicate the direction of rays in the figure.
(e) If any of the mirrors is removed, will he be able to see the object?
Q 23 – While playing, something entered into Somya’s eye. She immediately washed her eye with cold water. But as the irritation persisted, she immediately reported to her class teacher. Her class teacher took her to an eye doctor.
- What should be done if some foreign particles enter your eyes?
- Why is it not advised to rub your eyes when there is an eye irritation due to foreign particles?
- Do you think Somya was right in her action?
- What value of Somya is seen here?
Q 24 – Make your own mirror. Take a glass strip or glass slab, clean it and put it on a white sheet of paper. See yourself in the glass. Next put the glass slab on a black sheet of paper. Again look into the glass. In which case do you see yourself better and why?
Q 25 – Meet an eye specialist. Get your eye sight checked and discuss how to take care of your eyes.