Question 1 :
A convex lens of focal length 20 cm can produce a magnified virtual as well as real image. Where shall the object be placed for obtaining VIRTUAL image?

Question 2 :
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 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 :
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 5 :
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 6 :
What type of image will form by a convex lens, when an object is placed at twice the focal length of the lens.

Question 7 :
Where will the image form by a concave mirror, when an object is placed between pole and focus of the mirror.

Question 8 :
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 9 :
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 10 :
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 11 :
In which of the following, the image of an object placed at infinity will be highly diminished and point sized?

Question 12 :
Where will the image form by a concave mirror, when an object is placed between focus and centre of curvature of the mirror.

Question 13 :
What type of image will form by a concave lens, when an object is placed at the focus of the lens.

Question 14 :
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 15 :
What type of image will form by a concave mirror, when an object is placed a little beyond centre of curvature of the mirror.

Question 16 :
Where will the image form by a convex mirror, when an object is placed at finite distance from the mirror

Question 17 :
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 focus and optical centre on the same side as that of the object.

Question 18 :
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 19 :
<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?