A concave lens has focal length ofcm. At what distance from the lens a 5 cm tall object be placed so that it forms an image atcm from the lens? Also calculate the size of the image formed.
u=-60; h' =(5/4)
u=-60; h' =(4/5)
u= +60; h' =(5/4)
u=+60; h' =(4/5)
Q.6.
A ray of light is travelling from a rarer medium to a denser medium. While entering the denser medium at the point of incidence, it:
goes straight into the second medium
bends towards the normal
bends away from the normal
does not enter at all
Q.7.
A point object is placed at a distance ofcm from a convex mirror of focal lengthcm. The image will form at:
at infinity
at focus
at pole
behind the mirror.
Q.8.
Which of the following statements is/are true?
A convex lens has 4 dioptre power having a focal length 0.25 m
A convex lens has -4 dioptre power having a focal length 0.25 m
A concave lens has 4 dioptre power having a focal length 0.25 m
A concave lens has – 4 dioptre having a focal 0.25 m
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