Previous Year Questions
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Ray Optics And Optical Instruments

- It's good to be already prepared. Go through the previous year questions
1
Pick the wrong answer in the context with rainbow.
A
When the light rays undergo two internal reflections in a water drop, a secondary rainbow is formed
B
The order of colours is reversed in the secondary rainbow
C
An observer can see a rainbow when his front is towards the sun
D
Rainbow is a combined effect of dispersion refraction and reflection of sunlight
An astronomical refracting telescope will have large angular magnification and high resolution, when it has an objective lens of :
A
Large focal length and large diameter
B
Small focal length and large diameter
C
Small focal length and small diameter
D
Large focal length and small diameter