Question

Part 3 : Diverging Lens

Table 3: Diverging Lens
Image distance for lens A= 15 cm	Object distance for lens C= -5 cm
Image distance for lens C= 8 cm	Focal length for lens C = ……cm (Use lens formula)

Analysis Questions:

6. Lens A had a real object whereas lens C had a virtual object. What do you notice is the difference between the incident rays approaching each lens?

7. What do you notice is the difference between the rays leaving lens A and those leaving the plane mirror in last week’s lab?

Part 4 : The Telescope

Table 4: Telescope
Focal length for lens A= 10	Focal length for lens B= 40 cm
Theoretical angular magnification= fB/fA=………	Measured magnification = 4

Answer 1

6 in case of real object rays really cross the lens and then it's refraction occur .But in case of virtual object ray do not really cross the lens it just appear to coming from a point or object which is image .

7 rays leaving lens A are reflected ray but in case of mirror those rays are reflected ray .