Recent content by rubykap

yes lens formula is 1/s + 1/s' = 1/ f

the dimensions of the picture on a 35mm color slide are 24X36 mm,an image of the slide is projected on a screen 9.00 m from the projector lens.the focal length of projectorlens is 150mm. 1-- how far is the slide from the lens 2-- what are the image on the screen. Plz some body help me...i m...

[b]1. The problem statemen two mirrors are place together ,show that a point source in front of these mirrors and its two images lie on a circle. _--find the centre of circle --- in a diagram show where an observer should stand so as to be able to see both images. I am not getting...