Question 1 :
The size of the pupil becomes ______ when you see in dim light.
Question 2 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d07cf59b460d7261f300.jpg' />
In the above figure, 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 $25^\circ$ falls on mirror B after reflection. The angle of reflection for the ray reflected from mirror B would be
Question 4 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d075f59b460d7261f2f6.jpg' />
Boojho planned an activity to observe an object A through pipes as shown in the above figure, so that he could see objects which he could not directly see. Let us assume that mirrors are placed at the turns so that he can see the object. If any of the mirrors is removed, will he be able to see the objects?
Question 6 :
How many images of a candle will be formed if it is placed between two parallel plane mirrors separated by 40 cm?
Question 7 :
Mention whether regular or diffused reflection will take place when a beam of light strikes on a Piece of paper?
Question 8 :
Mention whether regular or diffused reflection will take place when a beam of light strikes on White Chalk powder that is used in school?
Question 11 :
Fill in the blanks: Night birds have ___________ cones than rods in their eyes.
Question 12 :
The lens focuses light on the back of the eye, on a layer called?
Question 16 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d0fbf59b460d7261f3a1.PNG' />
Refer to the above figure. Can Paheli at B see the position of the image of an object situated at A in the plane mirror ?
Question 17 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d078f59b460d7261f2fa.jpg' />
Boojho planned an activity to observe an object A through pipes as shown in the above figure, so that he could see objects which he could not directly see. How many mirrors should he use to see the objects?
Question 19 :
Where does the lens of our eye form the
image of an object?
Question 20 :
Mention whether regular or diffused reflection will take place when a beam of light strikes on Mirror?
Question 21 :
Mention whether regular or diffused reflection will take place when a beam of light strikes on Cardboard surface?
Question 24 :
At the junction of the optic nerve and the retina, there are no sensory cells, so no vision is possible at that spot. This is called the _________?
Question 25 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d0dcf59b460d7261f379.JPG' />
From the above image, Can Boojho at C see this image?
Question 26 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d07ef59b460d7261f302.jpg' />
In the above figure of the human eye, the cornea is represented by the letter
Question 27 :
How many images of a candle will be formed if it is placed between two parallel plane mirrors separated by 40 cm?
Question 28 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d07df59b460d7261f301.jpg' />
A small hole P is made in a piece of cardboard as shown in the above figure. The hole is illuminated by a torch. The pencil of light coming out of the hole falls on a mirror. At which point should the eye be placed so that the hole can be seen?
Question 29 :
The outer coat of the eye is white. It is tough so that it can protect the interior of the eye from accidents. Its transparent front part is called ______?
Question 30 :
Behind the cornea, we find a dark muscular structure called _____ ?
Question 31 :
In the iris, there is a small opening called the __________?
Question 32 :
Part of the eye which controls the light entering is called
Question 33 :
Suppose you are in a dark room. Can you see objects OUTSIDE the room?
Question 34 :
How many times is a ray of light reflected by two plane mirrors placed parallel and facing each other?
Question 35 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d0faf59b460d7261f39f.PNG' />
Refer to the above figure. Can Boojho at C see the position of the image of an object situated at A in the plane mirror ?
Question 37 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d073f59b460d7261f2f3.jpg' />
Boojho planned an activity to observe an object A through pipes as shown in the above figure, so that he could see objects which he could not directly see. What must be the angle with respect to the incident light at which he should place the mirrors?
Question 38 :
An interesting feature of a kaleidoscope is that you will never see the same pattern again. Is it TRUE OR FALSE?
Question 39 :
Mention whether regular or diffused reflection will take place when a beam of light strikes on Polished wooden table?
Question 40 :
Boojho while waving his hand very fast in front of his eyes,
observes that his fingers appear blurred. What could be the reason
for it?
Question 42 :
Which one of the following is an example of illuminated object?
