282440 A candle placed \(25 \mathrm{~cm}\) from a lens forms an image on a screen placed \(75 \mathrm{~cm}\) on the other side of the lens. The focal length and type of the lens should be :

282441 Which of the following is the correct lens formula?

282442 Two lenses of focal length \(100 \mathrm{~cm}\) and \(8 \mathrm{~cm}\); one convex and other concave are placed on the same optic axis at a separation of \(90 \mathrm{~cm}\), as shown in figure. An object \(O\) is placed at a distance \(50 \mathrm{~cm}\) from the convex lens. Find the magnification of the two lens system.

282443 Assertion: When a convex lens \(\left(\mu_{\mathrm{g}}=3 / 2\right)\) of focal length \(f\) is dipped in water, its focal length becomes \(\frac{4}{3} f\).
Reason: The focal length of convex lens in water becomes \(3 f\).

282440 A candle placed \(25 \mathrm{~cm}\) from a lens forms an image on a screen placed \(75 \mathrm{~cm}\) on the other side of the lens. The focal length and type of the lens should be :

282441 Which of the following is the correct lens formula?

282442 Two lenses of focal length \(100 \mathrm{~cm}\) and \(8 \mathrm{~cm}\); one convex and other concave are placed on the same optic axis at a separation of \(90 \mathrm{~cm}\), as shown in figure. An object \(O\) is placed at a distance \(50 \mathrm{~cm}\) from the convex lens. Find the magnification of the two lens system.

282443 Assertion: When a convex lens \(\left(\mu_{\mathrm{g}}=3 / 2\right)\) of focal length \(f\) is dipped in water, its focal length becomes \(\frac{4}{3} f\).
Reason: The focal length of convex lens in water becomes \(3 f\).

282440 A candle placed \(25 \mathrm{~cm}\) from a lens forms an image on a screen placed \(75 \mathrm{~cm}\) on the other side of the lens. The focal length and type of the lens should be :

282441 Which of the following is the correct lens formula?

282442 Two lenses of focal length \(100 \mathrm{~cm}\) and \(8 \mathrm{~cm}\); one convex and other concave are placed on the same optic axis at a separation of \(90 \mathrm{~cm}\), as shown in figure. An object \(O\) is placed at a distance \(50 \mathrm{~cm}\) from the convex lens. Find the magnification of the two lens system.

282443 Assertion: When a convex lens \(\left(\mu_{\mathrm{g}}=3 / 2\right)\) of focal length \(f\) is dipped in water, its focal length becomes \(\frac{4}{3} f\).
Reason: The focal length of convex lens in water becomes \(3 f\).

282440 A candle placed \(25 \mathrm{~cm}\) from a lens forms an image on a screen placed \(75 \mathrm{~cm}\) on the other side of the lens. The focal length and type of the lens should be :

282441 Which of the following is the correct lens formula?

282442 Two lenses of focal length \(100 \mathrm{~cm}\) and \(8 \mathrm{~cm}\); one convex and other concave are placed on the same optic axis at a separation of \(90 \mathrm{~cm}\), as shown in figure. An object \(O\) is placed at a distance \(50 \mathrm{~cm}\) from the convex lens. Find the magnification of the two lens system.

282443 Assertion: When a convex lens \(\left(\mu_{\mathrm{g}}=3 / 2\right)\) of focal length \(f\) is dipped in water, its focal length becomes \(\frac{4}{3} f\).
Reason: The focal length of convex lens in water becomes \(3 f\).