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SubjectsScience
दृष्टि दोष
In Class 10 Science, this topic explains how common vision defects affect the eye’s ability to form a sharp image. Students learn about myopia (short-sightedness), hypermetropia (long-sightedness), and presbyopia, including their causes and correction with suitable concave, convex, or bifocal lenses. The topic also connects these defects with accommodation, the near point, and the far point of the human eye in the context of The Human Eye and the Colourful World.
TOPIC PRACTICE
Up to 2 questions from this page. Select your focus, then start.
The governing concept is gaseous exchange in plant nutrition. Stomata are microscopic pores, usually present in the epidermis of leaves, through which carbon dioxide enters and oxygen and water vapour may leave. Therefore option A is correct. Xylem transports water, phloem transports food, and villi absorb nutrients in the small intestine rather than exchange gases in leaves.
View question detailsIn myopia, the image of a distant object forms in front of the retina, so distant objects are not seen clearly. A concave lens diverges the incoming rays and shifts the image back onto the retina. A convex lens is generally used to correct hypermetropia. Exam tip: remember that myopia requires a diverging, or concave, lens.
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