Light – Reflection and Refraction
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See all →- A doctor has prescribed a corrective lens of power +1.5 D. Find the focal length of the lens. Power of lens, P= 1/f P= 1.5D f= 1/1.5 = 10/15 = 0.66 m A convex lens has a positive focal length. Hence, it is a convex lens or a convergin... 1
- Find the focal length of a lens of power -2.0 D. What type of lens is this? Power of lens, P= 1/f P= -2D f= -1/2 = -0.5 m A concave lens has a negative focal length. Hence, it is a concave lens. 1
- An object of size 7.0 cm is placed at 27 cm in front of a concave mirror of focal length 18 cm. https://www.youtube.com/watch?v=meqKmlYN_p8&ab_channel=2Piclasses An object of size 7.0 cm is placed at 27 cm in front of a concave mirror o... 2
- An object 5 cm is placed at a distance of 20 cm in front of a convex mirror of radius of curvature 30 cm. https://youtu.be/Axatke6lD44 2
- The magnification produced by a plane mirror is +1. What does this mean? The positive sign means image formed by a plane mirror is virtual and erect. Since the magnification is 1 it means that the size of the imag... 1
- An object is placed at a distance of 10 cm from a convex mirror of focal length 15 cm. An object is placed at a distance of 10 cm from a convex mirror of focal length 15 cm. Find the position and nature of the image. https://yo... 2