Std. 10th , CET Preparation , Science 1, chapter 7 , lenses MCQs for Practice

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A parallel beam of light is incident on the system of two convex lenses of focal length f_(1)=20cm and f_(2)=10cm . What should be the distance between the two lenses so that rays after refraction from both the lenses pass undeviated?

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Two glasses with refractive indices of 1.5 and 1.7 are used to make two indentical double convex lenses. Find the ratio between their focal lengths. How will each of these lenses act on a ray parallel to its optical axis if the lenses are submerged into a transparent liquid with a refractive index of 1.6?

The focal length of the objective and eye lenses of a microscope are 1.6 cm and 2.5 cm respectively. The distance between the two lenses is 21.7 cm. If the final image is formed at infinity. What is the linear magnification ?

In the 10^(th) grade of Brooklyn Public School, the ratio of the number of boys to the number of girls was 3: 5 . Among the students , some had taken up literature as a specialzation while the rest had taken up science. The ratio of the number of literature students to science students was 5: 7 . If it is known that one - thrid the number of boys had taken up science as a specialization , what fraction of the girls had literature as their specialization ?

In a laboratory four convex lenses L_(1), L_(2), L_(3) and L_(4) of focal lengths 2,4,6 and 8 cm respectively are available. Two of these lenses form a telescope of length 10 cm and magnifying power 4 . The objective and eye lenses are