A student focuses the image of a candle flame, placed at about 2 m from a convex lens of focal length 10 cm, on a screen. After that he moves gradually the flame towards the lens and each time focuses its image on the screen.
- In which direction does he move the lens to focus the flame on the screen?
- What happens to the size of the image of the flame formed on the screen?
- What difference is seen in the intensity (brightness) of the image of the flame on the screen?
- What is seen on the screen when the flame is very close (at about 5 cm) to the lens?
CBSE OUTSIDE DELHI - SET 3 2017
Download our app for free and get started
- He moves the lens away from the screen to focus the image.
- Size of the image increases.
- The intensity of image decreases as the flame moves towards the lens.
- Nothing can be seen on the screen as in this case the image formed is virtual which can't be obtained on the screen.
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 SolutionWhat is the relation between the focal length and radius of curvature of a spherical mirror (concave mirror or convex mirror)? Calculate the focal length of a spherical mirror whose radius of curvature is 25cm.
- 2View SolutionThe optician’s prescription for a spectacle lens is marked +0.5D. What is the:
- Nature of spectacle lens?
- Focal length of spectacle lens?
- 3View SolutionThree convex lenses are available having focal lengths of 4cm, 40cm and 4m respectively. Which one would you choose as a magnifying glass and why?
- 4The refractive index of glass is 1.5 . Calculate the speed of light in glass. The speed of light in air is $3.0 \times 10^8 ms^{-1}$.View Solution
- 5View SolutionAn object is placed at a distance of 30cm in front of a convex mirror of focal length 15cm. Write four characteristics of the image formed by the mirror.
- 6View SolutionA convex lens is immersed in a liquid of refractive index greater than that of glass. How will the nature of lens change?
- 7The refractive indices of three media are given below :View Solution
A ray of light is travelling from $A$ to $B$ and another ray is travelling from $B$ to $C$.Medium Refractive Index A 1.6 B 1.8 C 1.5
(a) In which of the two cases the refracted ray bends towards the normal?
(b) In which case does the speed of light increase in the second medium?
Give reasons for your answer. - 8View SolutionGive two uses of a convex mirror. Explain why you would choose convex mirror for these uses.
- 9View SolutionWhich kind of mirrors are used in the headlights of a motorcar and why?
- 10View SolutionWhere would the image be formed by a convex mirror if the object is placed:
- Between infinity and pole of the mirror?
- At infinity?