(3)The loss and depreciation referred to in clause (ii) and clause (iii) of sub-section (2) shall be deemed to have been given full effect to and no further deduction for such loss or depreciation shall be allowed for any subsequent year:Provided that where there is a depreciation allowance in respect of a block of asset which has not been given full effect to prior to the assessment year beginning on the 1st day of April, 2020, corresponding adjustment shall be made to the written down value of such block of assets as on the 1st day of April, 2019 in the prescribed manner, if the option under sub-section (5) is exercised for a previous year relevant to the assessment year beginning on the 1st day of April, 2020.
