A small object is placed 150mm away from a diverging lens of focal length 100mm:
- Copy the figure below and draw rays to show how an image is formed by the lens.
- Calculate the distance of the image from the lens by using the lens formula.
Download our app for free and get started
u = -150mm f = -100mm$\frac{1}{\text{v}}-\frac{1}{\text{u}}=\frac{1}{\text{f}}$$\frac{1}{\text{v}}-\frac{1}{-150}=\frac{1}{-100}$
$\frac{1}{\text{v}}=-\frac{1}{100}-\frac{1}{150}$
$\frac{1}{\text{v}}=\frac{-5}{300}$
$\text{v}=60\text{mm}$
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 SolutionAt what distance from a concave mirror of focal length 10cm should an object 2cm long be placed in order to get an erect image 6cm tall?
- 2View SolutionA mirror forms an image which is 30cm from an object and twice its height.
- Where must the mirror be situated?
- What is the radius of curvature?
- Is the mirror convex or concave?
- 3View SolutionAn object is 2m from a lens which forms an erect image one-fourth (exactly) the size of the object. Determine the focal length of the lens. What type of lens is this?
- 4View SolutionUnder what condition in an arrangement of two plane mirrors, incident ray and reflected ray will always be parallel to each other, whatever may be angle of incidence. Show the same with the help of diagram.
- 5View SolutionState where an object must be placed so that the image formed by a concave mirror is:
- Erect and virtual.
- At infinity.
- The same size as the object.
- 6State the laws of refraction of light. If the speed of light in vacuum is $3 \times 10^{8} \text{ ms}^{-1},$ find the speed of light in a medium of absolute refractive index 1.5.View Solution
- 7View SolutionHow far should an object be placed from a convex lens of focal length 20 cm to obtain its image at a distance of 30 cm from the lens? What will be the height of the image if the object is 6 cm tall?
- 8View SolutionGive two circumstances in which a concave mirror can form a magnified image of an object placed in
front of it. Illustrate your answer by drawing labelled ray diagrams for both. - 9View SolutionA combination of lenses for a camera contains two converging lenses of focal lengths 20cm and 40cm and a diverging lens of focal length 50cm. Find the power and focal length of the combination.
- 10View SolutionDraw ray-diagrams to show the formation of images when the object is placed in front of a concave mirror (converging mirror):
- Between its pole and focus.
- Between its centre of curvature and focus Describe the nature, size and position of the image formed in each case.