EASY
7th CBSE
IMPORTANT
Earn 100

Sunrays falling on a concave mirror after reflection are allowed to fall on pieces of paper. The paper start burning. What is the focal length of the mirror?
 

Important Questions on Light

EASY
7th CBSE
IMPORTANT
Science 7>Chapter 15 - Light>Oral Questions>Q 3
Under what conditions, should a concave mirror, form virtual image?
EASY
7th CBSE
IMPORTANT
Science 7>Chapter 15 - Light>Oral Questions>Q 4
Which mirror is used as a dentist’s mirror?
EASY
7th CBSE
IMPORTANT
Science 7>Chapter 15 - Light>Oral Questions>Q 5
Which mirror is used as a side-view mirror in automobiles?
EASY
7th CBSE
IMPORTANT
Science 7>Chapter 15 - Light>Oral Questions>Q 1
A lens is thicker at the edges and thinner in the middle. Can it burn pieces of paper by focussing sunlight?
EASY
7th CBSE
IMPORTANT
Science 7>Chapter 15 - Light>Oral Questions>Q 2
A lens always forms a diminished, erect and virtual image. Identify the nature of the lens.
EASY
7th CBSE
IMPORTANT
Science 7>Chapter 15 - Light>Oral Questions>Q 3
A lens forms a magnified, erect and virtual image when an object is placed very close to it. Identify the lens.
EASY
7th CBSE
IMPORTANT
Science 7>Chapter 15 - Light>Oral Questions>Q 4
Which lens is used for correcting the long-sightedness?
EASY
7th CBSE
IMPORTANT
Science 7>Chapter 15 - Light>Oral Questions>Q 5

Each lens has a point, a ray passing through it goes without deviation. What is the name of that point and where is it located?