How to Use Google Lens in Hindi II Google Lens App II गूगल लेंस कैसे यूज करे? #Shorts #starsgtech

(a) A student suffering from myopia is not able to see distinctly the objects placed beyond 5 m . Two possible reasons due to which this defect of vision may have arisen. With the help of ray diagrams, explain : (i) Why the student is unable to see distinctly the objects placed beyond 5 m from his eyes. (ii) The type of corrective lens used to restore proper vision and how this defect is corrected by the use of this lens. (b) If in this case, numerical value of focal length of corrective lens is 5 m , find the power of the lens as per the new cartesion sign convention.

The rays of light falling on a convex lens in a direction parallel to principal axis of the lens, get refracted through the lens and meet actually at a single point F on the principal axis of the lens. This point is called principal focus of the lens. Read the above passage and answer the following questions : (i) Is principal focus of a convex lens, a real point ? Is the same true for a concave lens ? (ii) A distinct image of a distant tree os obtained on a screen held at 40 cm from a convex lens. What is its focal length ? (iii) Our teachers and parants advise us to stay focussed. What does it imply ?

Match the type of lens given in column I with their uses given in column II.

Rohit focused the image of a candle flame on a white screen using a convex lens. He noted down the position of the candle, screen and lens as under: Position of candle = 26.0 cm Position of convex lens = 50.0 cm Position of screen=74.0 cm (i) What is the focal length of the convex lens ? (ii) Where will the image be formed if he shifts the candle towards the lens at a position of 38 cm ? (iii) Draw a ray diagram to show the formation of the image in case (ii) as said above?

Statement I : A myopic person is advised to use concave lens. Statement II : The eye lens of a myopic person focuses the parallel rays coming from distant ogject in from distant objects in front of the retina.