Question

Differentiate between the following:
a) Concave mirror and Convex mirror
b) Real and Virtual image
Class 7 Chapter 15 light

Answer 1

☣ Question :-

Differentiate between the following:

a) Concave mirror and Convex mirror

b) Real and Virtual image

☣ Answer :-

a) Concave mirror and Convex mirror

➪ Concave mirror : ⤵

❶. The spoon is bulged outwards.

❷. Outer surface of cooking vessel.

❸. Sink outwards.

❹. Steel tumbler outwards.

❺. Rare view mirror.

❻. Outer surface of cycle bell.

❼. Outer surface of water filter.

❽. Dish antenna bulged outwards.

➪ Convex mirror : ⤵

❶. Spoon bulged inwards.

❷. Inner surface of cooking vessel.

❸. Sink (wash basin) inwards.

❹. Steel tumbler inwards.

❺. Shaving mirror.

❻. Inner surface of cycle bell.

❼. Inner surface of water filter.

❽. Dish antenna bulged inwards.

b) Real and Virtual image

➪ Real image : ⤵

❶. The image which is caught by a screen is called real image.

❷. In this the rays actually meet at the image point.

❸. It is always inverted.

❹. It is formed by concave mirror/convex lens.

❺. Image formed by actual intersection of reflected rays is real image.

➪ Virtual image : ⤵

❶. The image which is could not be caught by the screen is called virtual image.

❷. In this the rays appear to diverge from the image point.

❸. It is always erect.

❹. It is formed by convex mirror/plane mirror/concave mirror/concave lens.

❺. Image formed by meeting the extended reflected rays is virtual image.

Answer 2

Answer :-

Difference :-

1) Concave mirror and Convex mirror

Concave mirror

• Reflecting surface is curved.
• Concave mirror from larged image of close placed object .
• Concave mirror also used in solar project.
• Formed image is real .
• Image formed magnified.
• Image formed is diminished.
• Dentists use this mirror as shaving mirror.

Convex mirror

• Image formed is virtual.
• Formed image is erect .
• This mirror always form diminished image .
• This mirror give a wide feild of view although they make things small.
• Reflecting surface is curved.

2) Real and Virtual image

Real

• Obtained on screen.
• Real image always inverted.
• Ray reflect meet at point.

Virtual

• Cannot obtained on screen.
• Always erect .
• Its size may be same .