Describe the nature of image formed when the object is placed at a distance of 20cm from a concave mirror of focal length 10cm.
Download our app for free and get started
Hence, u = -20cm ; f = -10cm$\frac{1}{\text{v}}+\frac{1}{\text{u}}=\frac{1}{\text{f}}$
$ \Rightarrow\frac{1}{\text{v}}+\frac{1}{(-20)}=\frac{1}{-10}$
$ \Rightarrow\frac{1}{\text{v}}= \frac{1}{-20}-\frac{1}{-10}=\frac{1}{-20}$
$\therefore\text{v}=-20\text{cm}$
So, image will be real and inverted.
$ \Rightarrow\frac{1}{\text{v}}+\frac{1}{(-20)}=\frac{1}{-10}$
$ \Rightarrow\frac{1}{\text{v}}= \frac{1}{-20}-\frac{1}{-10}=\frac{1}{-20}$
$\therefore\text{v}=-20\text{cm}$
So, image will be real and inverted.
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
- 1View SolutionIt is desired to obtain an erect image of an object, using concave mirror of focal length of 12cm.
Where will the image of this object be, if it is placed 24cm in front of the mirror? Draw ray diagram for this situation also to justify your answer.
Show the positions of pole, principal focus and the centre of curvature in the above ray diagrams. - 2View SolutionA lens has a focal length of, -10cm. What is the power of the lens and what is its nature?
- 3The refractive index of water with respect to vacuum is $\frac{4}{3}$ and refractive index of vacuum with respect to glass is $\frac{2}{3}$ If the speed the speed of light in glass is $2 \times 10^8 ms^{-1}$, find the speed of light in (i) vacuum, (ii) water.View Solution
- 4View SolutionThe optician’s prescription for a spectacle lens is marked +0.5D. What is the:
- Nature of spectacle lens?
- Focal length of spectacle lens?
- 5View SolutionHow is the reflection of light ray from a plane mirror different from the refraction of light ray as it enters a block of glass?
- 6View SolutionAn object is placed well outside the principal focus of a convex lens. Draw a ray diagram to show how.
- 7View SolutionShow by drawing a ray-diagram that the image of an object formed by a concave lens is virtual, erect and diminished.
- 8View SolutionA concave mirror and a convex lens are held separately in water. What changes, if any, do you expect in the focal length of either?
- 9View SolutionDraw ray diagrams showing the image formation by a concave mirror when an object is placed:Between focus and centre of curvature of the mirror.
- 10View SolutionDiscuss the case when a convex lens forms a virtual and enlarged image.