Define the principal focus of a concave mirror.

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The point on the principal axis of a concave mirror where the rays of light coming from infinity or parallel to the principal axis meet after reflection from the mirror is called the principal focus of a concave mirror.

It is denoted by the symbol F.
The principal focus is also referred to as simply focus or focal point.
The principal focus of a concave mirror lies in front of the mirror.
The distance between the pole and the principal focus of the concave mirror is called the focal length.
A line passing through the principal focus and perpendicular to the principal axis on which the rays of light coming from a distant object making different angles with the principal axis converge or diverge is known as a focal plane.
A concave mirror is also known as a convergent mirror.

Location of principal focus of the concave mirror

Location of principal focus of the concave mirror

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Relevant Concepts
Difference between Reflection and Refraction	Laws of Reflection	Mirror Formula Derivation
Difference between Mirror and Lens	Reflection of Light	Refraction by Spherical Lenses
Power of a Lens	The Refractive Index	Concave Lens
Lens Formula and Magnification	Convex Lens	Image Formation by Lenses

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Define the principal focus of a concave mirror.

CBSE X Related Questions

1.
Assertion (A): Ozone at higher levels of atmosphere is a product of UV radiation acting on oxygen molecule.
Reason (R): The higher energy of UV splits apart some molecular \( O_2 \).

2.
Which of the following group is not 'biodegradable'?

3.
(i) \( \text{AgNO}_3 + \text{NaCl} \rightarrow \text{NaNO}_3 + \text{AgCl} \)
(ii) \( \text{K}_2\text{SO}_4 + \text{BaCl}_2 \rightarrow \text{BaSO}_4 + 2\text{KCl} \)
Which of the following options clearly describes both the reactions?

5.
Assertion : In human beings, the respiratory pigment is haemoglobin present in red blood cells.
Reason (R) : Haemoglobin has a very high affinity for carbon dioxide.

6.
Identify the correct statement for spirogyra, leishmania and hydra

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Define the principal focus of a concave mirror.

CBSE X Related Questions

1.Assertion (A): Ozone at higher levels of atmosphere is a product of UV radiation acting on oxygen molecule. Reason (R): The higher energy of UV splits apart some molecular \( O_2 \).

2.Which of the following group is not 'biodegradable'?

3.(i) \( \text{AgNO}_3 + \text{NaCl} \rightarrow \text{NaNO}_3 + \text{AgCl} \) (ii) \( \text{K}_2\text{SO}_4 + \text{BaCl}_2 \rightarrow \text{BaSO}_4 + 2\text{KCl} \) Which of the following options clearly describes both the reactions?

5.Assertion : In human beings, the respiratory pigment is haemoglobin present in red blood cells. Reason (R) : Haemoglobin has a very high affinity for carbon dioxide.

6.Identify the correct statement for spirogyra, leishmania and hydra

Similar Science Concepts

Comments

SUBSCRIBE TO OUR NEWS LETTER

1.
Assertion (A): Ozone at higher levels of atmosphere is a product of UV radiation acting on oxygen molecule.
Reason (R): The higher energy of UV splits apart some molecular \( O_2 \).

2.
Which of the following group is not 'biodegradable'?

3.
(i) \( \text{AgNO}_3 + \text{NaCl} \rightarrow \text{NaNO}_3 + \text{AgCl} \)
(ii) \( \text{K}_2\text{SO}_4 + \text{BaCl}_2 \rightarrow \text{BaSO}_4 + 2\text{KCl} \)
Which of the following options clearly describes both the reactions?

5.
Assertion : In human beings, the respiratory pigment is haemoglobin present in red blood cells.
Reason (R) : Haemoglobin has a very high affinity for carbon dioxide.

6.
Identify the correct statement for spirogyra, leishmania and hydra