Question 1 :
What type of image will form by a concave mirror, when an object is placed at centre of curvature of the mirror.

Question 2 :
Where will the image form by a convex lens, when an object is placed at the focus of the lens.

Question 3 :
Where will the image form by a concave mirror, when an object is placed between focus and centre of curvature of the mirror.

Question 4 :
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 5 :
One student uses a lens of focal length 50 cm and another of –50 cm. What is the nature of the lens respectively?

Question 6 :
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, What is the nature of the lens.

Question 7 :
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 8 :
In torches, search lights and headlights of vehicles the bulb is placed :

Question 9 :
Which of the following can make a parallel beam of light when light from a point source is incident on it?

Question 10 :
Where will the image form by a concave lens, when an object is placed between focus and twice the focal length of the lens.

Question 11 :
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 12 :
What type of image will form by a concave mirror, when an object is placed at infinity.

Question 13 :
What type of image will form by a concave lens, when an object is placed between focus and twice the focal length of the lens.

Question 14 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b19ced273b230584979b6c.PNG' /> <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61cc185478c526e972caea2a.PNG' /> In the above images, the first image is the ray of light incident on a concave mirror and the second image is the complete path of the ray. Is the second image correct depiction of the path?

Question 15 :
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 infinity and device, image formed is diminished and between pole and focus, behind it.

Question 16 :
Where will the image form by a convex lens, when an object is placed between focus and twice the focal length of the lens.

Question 17 :
What type of image will form by a concave lens, when an object is placed at the focus of the lens.

Question 18 :
A convex lens of focal length 20 cm can produce a magnified virtual as well as real image. Is this a correct statement?

Question 19 :
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 20 :
In torches, search lights and headlights of vehicles the bulb is placed :