Vivek Sharma while driving his bike sees a woman behind driving a moped through his rear-view mirror. He sees that her saree is almost touching the wheels of the vehicle. He stops her and alerts. Rear
view mirrors are diverging in nature and form smaller images near the pole of the mirror so that we can
easily see the traffic behind us.
(I) What kind of mirror is used as a rear-view mirror?
a)Convex mirror
b) Plane mirror
c) Concave mirror
d) None
(ii) Which one is the correct set of properties formed by this mirror?
a) Real, magnified
b)Real, diminished
c) Virtual, magnified
d) Virtual, diminished
(ii)If the radius of curvature of this mirror is 20 cm what is its focal length?
a)-10 cm
b)20 cm
c) 10 cm
d) none of these
(iv)A student tries to obtain an image on the screen using this mirror in the laboratory for a distant object
but he was unable to obtain it. Why?
a) Real images cannot be obtained on the screen
b)Real images are inverted so they cannot be obtained on the screen
c) Virtual images cannot be obtained on the screen
d) Virtual images are always hazy
Answers
Answer:
1. Vivek Sharma while driving his bike sees a woman behind driving a moped through his rear
vew mirror. He sees that her saree almost touching the wheels of the vehicle. He stops her and
alerts
Contextual question
What kind of mirror is used as a rear view mirror? Draw a ray diagram for the same mirror when
the object is placed between pole and infinity her and she ties the saree properly.
Value based question
What values you observe in Mr. Sharma?
Value points
1. Concern about others
2. Observation of Traffic rules
3. Responsible citizen
2. Deepak’s mom is finding difficult to cook in the kitchen as there was power cut, and she
was complaining about it to Deepak. He immediately took a plane mirror from his shelf made it
stand against a wall such that sun’s rays were focused into the kitchen due to the reflection of the
mirror. There was some lighting and his mother was able to finish her work.
Contextual question
What are the characteristics of the image formed by a plane mirror?
Value based question
What values did Deepak display?
Value points
1. Helping his mother
2. Is able to apply his mind at required times
3 Mrs Vincent, grade 5 teacher find that her students do not draw when she draws on the
board. Every time she had to turn towards them to see whether they draw and label the diagrams.
John, one of her students fixed two big convex mirrors at the two sides of the black board. Wit h
this Mrs. Vincent was able to draw and also supervise her students through the mirror. All the
students did their work properly.
Contextual question
A convex mirror has R= 3m . An object placed at 5m from this mirror , find the position and
nature of the image.
Value based question
What values did John exhibit?
Value points
1.Helping teacher and his peer group
2. application of knowledge
4 A boy is looking at the sun through a convex lens. His brother immediately takes away the lsns
Explanation: