Question 1 :
Rays from Sun converge at a point 15 cm in front of a concave mirror. Where should an object be placed so that size of its image is equal to the size of the object?

Question 2 :
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 3 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b19ce7273b230584979b65.PNG' /> In the above image, the light ray enters from medium A to medium B as shown. The refractive index of medium B relative to A will be :

Question 4 :
In which of the following, the image of an object placed at infinity will be highly diminished and point sized?

Question 6 :
You are provided with two lenses of focal length 20 cm and 40 cm respectively. Which lens will you use to obtain more convergent light?

Question 7 :
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 image?

Question 8 :
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 9 :
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 Where will the image be formed if he shifts the candle towards the lens at a position of 31.0 cm?

Question 10 :
Magnification produced by a rear view mirror fitted in vehicles :

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

Question 12 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b19cef273b230584979b6f.PNG' /> <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61cc185478c526e972caea29.PNG' /> In the above images, the first image is the ray of light incident on a convex lens and the second image is the complete path of the ray. Is the second image correct depiction of the path?

Question 13 :
One student uses a lens of focal length 50 cm and another of –50 cm. What is the power used by each of them, respectively?

Question 14 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b19ce9273b230584979b67.PNG' /> In the above image, the beam of light is incident through the holes on side A and emerges out of the holes on the other face of the box as shown. Which of the following could be inside the box?

Question 15 :
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 16 :
What type of image will form by a concave lens, when an object is placed at the focus of the lens.

Question 17 :
<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 18 :
Sudha finds out that the sharp image of the window pane of her science laboratory is formed at a distance of 15 cm from the lens. She now tries to focus the building visible to her outside the window instead of the window pane without disturbing the lens. In which direction will she move the screen to obtain a sharp image of the building?

Question 19 :
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?

Question 20 :
Where will the image form by a concave mirror, when an object is placed a little beyond centre of curvature of the mirror.

Question 21 :
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 23 :
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 24 :
In torches, search lights and headlights of vehicles the bulb is placed :

Question 25 :
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 26 :
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 image at a distance of 80 cm?

Question 27 :
Magnification produced by a rear view mirror fitted in vehicles :

Question 28 :
Under which of the following conditions a concave mirror can form an image larger than the actual object?

Question 29 :
Where will the image form by a concave mirror, when an object is placed between focus and centre of curvature of the mirror.

Question 30 :
What type of image will form by a convex lens, when an object is placed between focus and twice the focal length of the lens.