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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How many bulbs of resistance \( 8 \ \Omega \) each should be connected in parallel combination to draw a current of \( 2 \text{ A} \) from a battery of \( 4 \text{ V} \) ?

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2.
State two differences between the act of chewing food and salivation on sight of food.

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3.
When you look at an object very close to your eyes, the:

Ciliary muscles of your eye contract and the eye lens becomes thick.
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4.
(i) \( \text{AgNO}_3 + \text{NaCl} \rightarrow \text{NaNO}_3 + \text{AgCl} \)
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(i) is double displacement, (ii) is displacement reaction.
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Both, (i) and (ii) are double displacement reactions and precipitation reactions.
(i) is displacement, (ii) is double displacement reaction.

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5.
From the given situations, identify 'Chemotropic' and 'Geotropic' movements in parts of plants, respectively:
(i) Growth of pollen tube towards ovule.
(ii) Movement of sunflower towards sunlight.
(iii) Movement of root towards Earth/Gravity.
(iv) Movement of leaves due to breeze.

(i) and (iii) respectively
(iii) and (i) respectively
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(i), (iii) and (ii), (iv) respectively

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6.
Assertion (A): Reflex actions do not involve thinking.
Reason (R): Most reflex actions are controlled by the spinal cord.

Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).
Assertion (A) is true, but Reason (R) is false.
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Define the principal focus of a concave mirror.

CBSE X Related Questions

1.
How many bulbs of resistance \( 8 \ \Omega \) each should be connected in parallel combination to draw a current of \( 2 \text{ A} \) from a battery of \( 4 \text{ V} \) ?

2.
State two differences between the act of chewing food and salivation on sight of food.

3.
When you look at an object very close to your eyes, the:

4.
(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.
From the given situations, identify 'Chemotropic' and 'Geotropic' movements in parts of plants, respectively:
(i) Growth of pollen tube towards ovule.
(ii) Movement of sunflower towards sunlight.
(iii) Movement of root towards Earth/Gravity.
(iv) Movement of leaves due to breeze.

6.
Assertion (A): Reflex actions do not involve thinking.
Reason (R): Most reflex actions are controlled by the spinal cord.

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Define the principal focus of a concave mirror.

CBSE X Related Questions

1.How many bulbs of resistance \( 8 \ \Omega \) each should be connected in parallel combination to draw a current of \( 2 \text{ A} \) from a battery of \( 4 \text{ V} \) ?

2.State two differences between the act of chewing food and salivation on sight of food.

3.When you look at an object very close to your eyes, the:

4.(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.From the given situations, identify 'Chemotropic' and 'Geotropic' movements in parts of plants, respectively: (i) Growth of pollen tube towards ovule. (ii) Movement of sunflower towards sunlight. (iii) Movement of root towards Earth/Gravity. (iv) Movement of leaves due to breeze.

6.Assertion (A): Reflex actions do not involve thinking. Reason (R): Most reflex actions are controlled by the spinal cord.

Similar Science Concepts

Comments

SUBSCRIBE TO OUR NEWS LETTER

1.
How many bulbs of resistance \( 8 \ \Omega \) each should be connected in parallel combination to draw a current of \( 2 \text{ A} \) from a battery of \( 4 \text{ V} \) ?

2.
State two differences between the act of chewing food and salivation on sight of food.

3.
When you look at an object very close to your eyes, the:

4.
(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.
From the given situations, identify 'Chemotropic' and 'Geotropic' movements in parts of plants, respectively:
(i) Growth of pollen tube towards ovule.
(ii) Movement of sunflower towards sunlight.
(iii) Movement of root towards Earth/Gravity.
(iv) Movement of leaves due to breeze.

6.
Assertion (A): Reflex actions do not involve thinking.
Reason (R): Most reflex actions are controlled by the spinal cord.