What is meant by:
- Principal focus of a convex mirror.
- Focal length of a convex mirror?
Download our app for free and get started
- Principal focus of a convex mirror: The principal focus of a convex mirror is a point on its principal axis from which a beam of light rays, initially parallel to the axis, appears to diverge after being reflected from the convex mirror.
- Focal length of a concave mirror: The focal length of a convex mirror is the distance from the pole (P) to its principal focus (F).
Download our appand get started for free
Experience the future of education. Simply download our apps or reach out to us for more information. Let's shape the future of learning together!No signup needed.*
Similar Questions
- 1AB and CD, two spherical mirrors, form parts of a hollow spherical ball with its centre at O as shown in the diagram. If arc $\text{AB}=\frac{1}{2}$ arc CD, what is the ratio of their focal lengths? State which of the two mirrors will always form virtual image of an object placed in front of it and why.View Solution
- 2View SolutionRefractive indices of four media A, B, C and D are given below:
In which of these four media is the speed of light:MediumRefractive indexABCD1.331.441.521.65- Maximum, and
- Minimum?
- 3View SolutionDefine:
- Principal focus of a concave mirror.
- Focal length of a concave mirror.
- 4View SolutionAn object of height 4.0cm is placed at a distance of 30cm from the optical centre ‘O’ of a convex lens of focal length 20cm. Draw a ray diagram to find the position and size of the image formed. Mark optical centre ‘O’ and principal focus ‘F’ on the diagram. Also find the approximate ratio of size of the image to the size of the object.
- 5View SolutionDraw a ray diagram to show the formation of a real diminished image of an object by a convex lens. In your diagram, the position of object and image with respect to the principal focus should be shown clearly.
- 6AB and CD, two spherical mirrors, form parts of a hollow spherical ball with its centre at O as shown in the diagram. If arc $\text{AB}=\frac{1}{2}$ arc CD, what is the ratio of their focal lengths? State which of the two mirrors will always form virtual image of an object placed in front of it and why.View Solution
- 7View SolutionA convex lens forms a real and inverted image of a needle at a distance of 50 cm from it. Where is the needle placed in front of the convex lens if the image is equal to the size of the object? Also, find the power of the lens.
- 8View SolutionBriefly describe how you would find the focal length of a concave mirror quickly but approximately.
- 9View SolutionYou are provided with two lenses of focal lengths 10cm and 20cm. Which of the two lenses would you suggest to obtain greater convergence on refracted light? Justify your choice.
- 10View SolutionDraw a ray diagram showing how a concave mirror can be used to produce a real, inverted and diminished image of an object.