Question Text
Question 1 :
What type of image will form by a concave lens, when an object is placed at the focus of the lens.
Question 2 :
Complete this law of refraction: Ratio of sine of angle of incidence and sine of angle of refraction is ________________ for the given color and pair of media.
Question 3 :
Size of image of an object by a mirror having a focal length of 20 cm is observed to be reduced to 1/3rd of its size. At what distance the object has been placed from the mirror?
Question 4 :
A student focussed the image of a candle flame on a white screen using a convex lens. He noted down the position of the candle screen and the lens as under:
Position of candle = 12.0 cm, Position of convex lens = 50.0 cm, Position of the screen = 88.0 cm
What is the focal length of the convex lens?
Question 5 :
Magnification produced by a rear view mirror fitted in vehicles :
Question 6 :
Size of image of an object by a mirror having a focal length of 20 cm is observed to be reduced to 1/3rd of its size. What is the nature of the mirror?
Question 7 :
What type of image will form by a concave mirror, when an object is placed between focus and centre of curvature of the mirror.
Question 8 :
Identify the device used as a spherical mirror or lens in the given case. When the image formed is virtual and erect in this case.
CASE: Object is placed between device and its focus, image formed is enlarged and behind it.
Question 9 :
Where will the image form by a concave mirror, when an object is placed between pole and focus of the mirror.
Question 10 :
The image of a candle flame formed by a lens is obtained on a screen placed on the other side of the lens. If the image is three times the size of the flame and the distance between lens and image is 80 cm, at what distance should the candle be placed from the lens?