Physics
A lens of focal length 20 cm forms an inverted image at a distance 60 cm from the lens.
(i) Identify the lens.
(ii) How far is the lens present in front of the object?
(iii) Calculate the magnification of the image.
Related Questions
A diver in water looks obliquely at an object AB in air.
(i) Does the object appear taller, shorter or of the same size to the diver?
(ii) Show the path of two rays AC & AD starting from the tip of the object as it travels towards the diver in water and hence obtain the image of the object.
Complete the path of the ray AB through the glass prism in PQR till it emerges out of the prism. Given the critical angle of the glass as 42°.
Give reasons for the following:
During the day:
(i) Clouds appear white.
(ii) Sky appears blue.
(i) Name the system which enables us to locate underwater objects by transmitting ultrasonic waves and detecting the reflecting impulse.
(ii) What are acoustically measurable quantities related to pitch and loudness?