CBSE Class 10 Physics Refraction Through Spherical Lens
- Why is a convex lens with smaller focal length and not a longer one used as a magnifcation glass
- A 4.0 cm tall object is placed perpendicular ( e.at 90) to the principal axis of a convex lens of food length 10 cm . The distance of the object from the lens is 15cm. Find the math, position and size of the image.Also find its magnification.
- Why is object placed between 2f1 and f1 in a convex lens projector ?
- 35. 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. (A) In which direction does he move the lens to focus the flame on the screen? (B) What happens to the size of the image of the flame formed on the screen? (C) What difference is seen in the intensity (brightness) of the image of the flame on the screen? (D) What is seen on the screen when the flame is very close (at about 5 cm) to the lens?
- How many types of image forms due to lenses ? What are those ? Mention the differences
- An object 50cm tall is placed on the principal axis of a convex lens.Its 20cm tall image
- How does the size of image change as the object is brought from closer to infinite towards the convex lens?
- The object 5cm high is placed in front of a lens of power +2D. Two times real and magnified image of the object is attained by the lens. Find 1)Object distance 2)Image distance 3)height of the image
- relation between intensity of image and aperture when half of the lens is covered
- An object is placed before a concave lens of focal length 12cm. The size of the image formed by the lens is half the size of the object. Calculate the distance.
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